ARROW-2578: [Plasma] Use mersenne twister to generate random number - #2039

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ARROW-2578: [Plasma] Use mersenne twister to generate random number#2039
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@pcmoritzpcmoritz commented May 14, 2018•
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This gets rid of the std::random_device, which is slow and causes errors in valgrind. Instead we use the std::mt19937 Mersenne Twister.

@pcmoritzpcmoritz changed the title ARROW-2578: Use mersenne twister to generate random numberARROW-2578: [Plasma] Use mersenne twister to generate random numberMay 14, 2018
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Codecov Report

Merging #2039 into master will increase coverage by 1.19%.
The diff coverage is 100%.

Impacted file tree graph

@@ Coverage Diff @@## master #2039 +/- ##
==========================================
+ Coverage 86.28% 87.48% +1.19% 
==========================================
Files 11 178 +167 Lines 773 28595 +27822 ==========================================
+ Hits 667 25015 +24348 - Misses 106 3580 +3474
Impacted FilesCoverage Δ
cpp/src/plasma/test/client_tests.cc100% <100%> (ø)
cpp/src/plasma/common.cc94.11% <100%> (ø)
rust/src/lib.rs
rust/src/memory.rs
rust/src/error.rs
rust/src/list_builder.rs
rust/src/bitmap.rs
rust/src/array.rs
rust/src/datatypes.rs
rust/src/memory_pool.rs
... and 181 more

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robertnishihara
robertnishihara reviewed May 14, 2018
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Comment threadcpp/src/plasma/common.cc Outdated
#include <limits>
#include <mutex>
#include <random>
#include <thread>

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Is this still needed?

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fixed

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Comment threadcpp/src/plasma/common.cc Outdated
static std::mutex mutex;
std::lock_guard<std::mutex> lock(mutex);
static std::mt19937 generator;
std::uniform_int_distribution<uint32_t> d(0, std::numeric_limits<uint8_t>::max());

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minor, but I'm not a huge fan of the variable name d

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fixed

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+1 merging this now to remove the valgrind testing error

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pcmoritz deleted the new-rng branch May 14, 2018 08:19
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This PR is constructing a generator with a fixed seed, so now distinct processes will trivially collide when generate random ids:

$ python -c "from pyarrow import plasma; print(plasma.ObjectID.from_random())"
ObjectID(d022e7d520f8e938a14e188c47308cfef5fff7f7)
$ python -c "from pyarrow import plasma; print(plasma.ObjectID.from_random())"
ObjectID(d022e7d520f8e938a14e188c47308cfef5fff7f7)

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I just saw this and opened a JIRA here: https://issues.apache.org/jira/browse/ARROW-3018

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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
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}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

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ARROW-2578: [Plasma] Use mersenne twister to generate random number - #2039
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ARROW-2578: [Plasma] Use mersenne twister to generate random number#2039
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@pcmoritzpcmoritz
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May 14, 2018•

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This gets rid of the std::random_device, which is slow and causes errors in valgrind. Instead we use the std::mt19937 Mersenne Twister.
@pcmoritzpcmoritz
changed the title
ARROW-2578: Use mersenne twister to generate random numberARROW-2578: [Plasma] Use mersenne twister to generate random numberMay 14, 2018
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Codecov Report
Merging #2039 into master will increase coverage by 1.19%.

The diff coverage is 100%.
Impacted file tree graph
@@ Coverage Diff @@## master #2039 +/- ##
==========================================
+ Coverage 86.28% 87.48% +1.19% 
==========================================
Files 11 178 +167 Lines 773 28595 +27822 ==========================================
+ Hits 667 25015 +24348 - Misses 106 3580 +3474
Impacted FilesCoverage Δ
cpp/src/plasma/test/client_tests.cc100% <100%> (ø)
cpp/src/plasma/common.cc94.11% <100%> (ø)
rust/src/lib.rs
rust/src/memory.rs
rust/src/error.rs
rust/src/list_builder.rs
rust/src/bitmap.rs
rust/src/array.rs
rust/src/datatypes.rs
rust/src/memory_pool.rs
... and 181 more
Continue to review full report at Codecov.
Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data

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robertnishihara
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Comment threadcpp/src/plasma/common.cc
Outdated

#include <limits>
#include <mutex>
#include <random>
#include <thread>
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Is this still needed?
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fixed
robertnishihara
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Comment threadcpp/src/plasma/common.cc
Outdated

 static std::mutex mutex;
 std::lock_guard<std::mutex> lock(mutex);
 static std::mt19937 generator;
 std::uniform_int_distribution<uint32_t> d(0, std::numeric_limits<uint8_t>::max());
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minor, but I'm not a huge fan of the variable name d
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fixed
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+1 merging this now to remove the valgrind testing error
@pcmoritz
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deleted the

new-rng

branch
May 14, 2018 08:19
@pitrou
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May 16, 2018

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This PR is constructing a generator with a fixed seed, so now distinct processes will trivially collide when generate random ids:
$ python -c "from pyarrow import plasma; print(plasma.ObjectID.from_random())"
ObjectID(d022e7d520f8e938a14e188c47308cfef5fff7f7)
$ python -c "from pyarrow import plasma; print(plasma.ObjectID.from_random())"
ObjectID(d022e7d520f8e938a14e188c47308cfef5fff7f7)

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Aug 7, 2018

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I just saw this and opened a JIRA here: https://issues.apache.org/jira/browse/ARROW-3018
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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ARROW-2578: [Plasma] Use mersenne twister to generate random number - #2039
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pcmoritz wants to merge 8 commits into
apache:masterfrom 
pcmoritz:new-rng
Closed
ARROW-2578: [Plasma] Use mersenne twister to generate random number#2039
pcmoritz wants to merge 8 commits into
apache:masterfrom 
pcmoritz:new-rng
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@pcmoritz
@pcmoritzpcmoritz
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May 14, 2018•

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This gets rid of the std::random_device, which is slow and causes errors in valgrind. Instead we use the std::mt19937 Mersenne Twister.
@pcmoritzpcmoritz
changed the title
ARROW-2578: Use mersenne twister to generate random numberARROW-2578: [Plasma] Use mersenne twister to generate random numberMay 14, 2018
@codecov-io
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Codecov Report
Merging #2039 into master will increase coverage by 1.19%.

The diff coverage is 100%.
Impacted file tree graph
@@ Coverage Diff @@## master #2039 +/- ##
==========================================
+ Coverage 86.28% 87.48% +1.19% 
==========================================
Files 11 178 +167 Lines 773 28595 +27822 ==========================================
+ Hits 667 25015 +24348 - Misses 106 3580 +3474
Impacted FilesCoverage Δ
cpp/src/plasma/test/client_tests.cc100% <100%> (ø)
cpp/src/plasma/common.cc94.11% <100%> (ø)
rust/src/lib.rs
rust/src/memory.rs
rust/src/error.rs
rust/src/list_builder.rs
rust/src/bitmap.rs
rust/src/array.rs
rust/src/datatypes.rs
rust/src/memory_pool.rs
... and 181 more
Continue to review full report at Codecov.
Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data

Powered by Codecov. Last update 19af862...21d0e3f. Read the comment docs.
robertnishihara
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View reviewed changes
Comment threadcpp/src/plasma/common.cc
Outdated

#include <limits>
#include <mutex>
#include <random>
#include <thread>
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Is this still needed?
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fixed
robertnishihara
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Comment threadcpp/src/plasma/common.cc
Outdated

 static std::mutex mutex;
 std::lock_guard<std::mutex> lock(mutex);
 static std::mt19937 generator;
 std::uniform_int_distribution<uint32_t> d(0, std::numeric_limits<uint8_t>::max());
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minor, but I'm not a huge fan of the variable name d
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fixed
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+1 merging this now to remove the valgrind testing error
@pcmoritz
pcmoritz
deleted the

new-rng

branch
May 14, 2018 08:19
@pitrou
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May 16, 2018

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This PR is constructing a generator with a fixed seed, so now distinct processes will trivially collide when generate random ids:
$ python -c "from pyarrow import plasma; print(plasma.ObjectID.from_random())"
ObjectID(d022e7d520f8e938a14e188c47308cfef5fff7f7)
$ python -c "from pyarrow import plasma; print(plasma.ObjectID.from_random())"
ObjectID(d022e7d520f8e938a14e188c47308cfef5fff7f7)

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Aug 7, 2018

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I just saw this and opened a JIRA here: https://issues.apache.org/jira/browse/ARROW-3018
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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ARROW-2578: [Plasma] Use mersenne twister to generate random number - #2039
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pcmoritz wants to merge 8 commits into
apache:masterfrom 
pcmoritz:new-rng
Closed
ARROW-2578: [Plasma] Use mersenne twister to generate random number#2039
pcmoritz wants to merge 8 commits into
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pcmoritz:new-rng
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This gets rid of the std::random_device, which is slow and causes errors in valgrind. Instead we use the std::mt19937 Mersenne Twister.
@pcmoritzpcmoritz
changed the title
ARROW-2578: Use mersenne twister to generate random numberARROW-2578: [Plasma] Use mersenne twister to generate random numberMay 14, 2018
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Codecov Report
Merging #2039 into master will increase coverage by 1.19%.

The diff coverage is 100%.
Impacted file tree graph
@@ Coverage Diff @@## master #2039 +/- ##
==========================================
+ Coverage 86.28% 87.48% +1.19% 
==========================================
Files 11 178 +167 Lines 773 28595 +27822 ==========================================
+ Hits 667 25015 +24348 - Misses 106 3580 +3474
Impacted FilesCoverage Δ
cpp/src/plasma/test/client_tests.cc100% <100%> (ø)
cpp/src/plasma/common.cc94.11% <100%> (ø)
rust/src/lib.rs
rust/src/memory.rs
rust/src/error.rs
rust/src/list_builder.rs
rust/src/bitmap.rs
rust/src/array.rs
rust/src/datatypes.rs
rust/src/memory_pool.rs
... and 181 more
Continue to review full report at Codecov.
Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data

Powered by Codecov. Last update 19af862...21d0e3f. Read the comment docs.
robertnishihara
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May 14, 2018
View reviewed changes
Comment threadcpp/src/plasma/common.cc
Outdated

#include <limits>
#include <mutex>
#include <random>
#include <thread>
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Is this still needed?
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fixed
robertnishihara
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Comment threadcpp/src/plasma/common.cc
Outdated

 static std::mutex mutex;
 std::lock_guard<std::mutex> lock(mutex);
 static std::mt19937 generator;
 std::uniform_int_distribution<uint32_t> d(0, std::numeric_limits<uint8_t>::max());
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minor, but I'm not a huge fan of the variable name d
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fixed
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+1 merging this now to remove the valgrind testing error
@pcmoritz
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deleted the

new-rng

branch
May 14, 2018 08:19
@pitrou
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May 16, 2018

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This PR is constructing a generator with a fixed seed, so now distinct processes will trivially collide when generate random ids:
$ python -c "from pyarrow import plasma; print(plasma.ObjectID.from_random())"
ObjectID(d022e7d520f8e938a14e188c47308cfef5fff7f7)
$ python -c "from pyarrow import plasma; print(plasma.ObjectID.from_random())"
ObjectID(d022e7d520f8e938a14e188c47308cfef5fff7f7)

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I just saw this and opened a JIRA here: https://issues.apache.org/jira/browse/ARROW-3018
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

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ARROW-2578: [Plasma] Use mersenne twister to generate random number - #2039
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pcmoritz wants to merge 8 commits into
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ARROW-2578: [Plasma] Use mersenne twister to generate random number#2039
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This gets rid of the std::random_device, which is slow and causes errors in valgrind. Instead we use the std::mt19937 Mersenne Twister.
@pcmoritzpcmoritz
changed the title
ARROW-2578: Use mersenne twister to generate random numberARROW-2578: [Plasma] Use mersenne twister to generate random numberMay 14, 2018
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Codecov Report
Merging #2039 into master will increase coverage by 1.19%.

The diff coverage is 100%.
Impacted file tree graph
@@ Coverage Diff @@## master #2039 +/- ##
==========================================
+ Coverage 86.28% 87.48% +1.19% 
==========================================
Files 11 178 +167 Lines 773 28595 +27822 ==========================================
+ Hits 667 25015 +24348 - Misses 106 3580 +3474
Impacted FilesCoverage Δ
cpp/src/plasma/test/client_tests.cc100% <100%> (ø)
cpp/src/plasma/common.cc94.11% <100%> (ø)
rust/src/lib.rs
rust/src/memory.rs
rust/src/error.rs
rust/src/list_builder.rs
rust/src/bitmap.rs
rust/src/array.rs
rust/src/datatypes.rs
rust/src/memory_pool.rs
... and 181 more
Continue to review full report at Codecov.
Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data

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robertnishihara
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Comment threadcpp/src/plasma/common.cc
Outdated

#include <limits>
#include <mutex>
#include <random>
#include <thread>
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Is this still needed?
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fixed
robertnishihara
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Comment threadcpp/src/plasma/common.cc
Outdated

 static std::mutex mutex;
 std::lock_guard<std::mutex> lock(mutex);
 static std::mt19937 generator;
 std::uniform_int_distribution<uint32_t> d(0, std::numeric_limits<uint8_t>::max());
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minor, but I'm not a huge fan of the variable name d
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fixed
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+1 merging this now to remove the valgrind testing error
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May 14, 2018 08:19
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This PR is constructing a generator with a fixed seed, so now distinct processes will trivially collide when generate random ids:
$ python -c "from pyarrow import plasma; print(plasma.ObjectID.from_random())"
ObjectID(d022e7d520f8e938a14e188c47308cfef5fff7f7)
$ python -c "from pyarrow import plasma; print(plasma.ObjectID.from_random())"
ObjectID(d022e7d520f8e938a14e188c47308cfef5fff7f7)

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I just saw this and opened a JIRA here: https://issues.apache.org/jira/browse/ARROW-3018
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
ARROW-2578: [Plasma] Use mersenne twister to generate random number - #2039
Closed
pcmoritz wants to merge 8 commits into
apache:masterfrom 
pcmoritz:new-rng
Closed
ARROW-2578: [Plasma] Use mersenne twister to generate random number#2039
pcmoritz wants to merge 8 commits into
apache:masterfrom 
pcmoritz:new-rng
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May 14, 2018•

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This gets rid of the std::random_device, which is slow and causes errors in valgrind. Instead we use the std::mt19937 Mersenne Twister.
@pcmoritzpcmoritz
changed the title
ARROW-2578: Use mersenne twister to generate random numberARROW-2578: [Plasma] Use mersenne twister to generate random numberMay 14, 2018
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May 14, 2018•

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Codecov Report
Merging #2039 into master will increase coverage by 1.19%.

The diff coverage is 100%.
Impacted file tree graph
@@ Coverage Diff @@## master #2039 +/- ##
==========================================
+ Coverage 86.28% 87.48% +1.19% 
==========================================
Files 11 178 +167 Lines 773 28595 +27822 ==========================================
+ Hits 667 25015 +24348 - Misses 106 3580 +3474
Impacted FilesCoverage Δ
cpp/src/plasma/test/client_tests.cc100% <100%> (ø)
cpp/src/plasma/common.cc94.11% <100%> (ø)
rust/src/lib.rs
rust/src/memory.rs
rust/src/error.rs
rust/src/list_builder.rs
rust/src/bitmap.rs
rust/src/array.rs
rust/src/datatypes.rs
rust/src/memory_pool.rs
... and 181 more
Continue to review full report at Codecov.
Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data

Powered by Codecov. Last update 19af862...21d0e3f. Read the comment docs.
robertnishihara
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Comment threadcpp/src/plasma/common.cc
Outdated

#include <limits>
#include <mutex>
#include <random>
#include <thread>
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Is this still needed?
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fixed
robertnishihara
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Comment threadcpp/src/plasma/common.cc
Outdated

 static std::mutex mutex;
 std::lock_guard<std::mutex> lock(mutex);
 static std::mt19937 generator;
 std::uniform_int_distribution<uint32_t> d(0, std::numeric_limits<uint8_t>::max());
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minor, but I'm not a huge fan of the variable name d
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fixed
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+1 merging this now to remove the valgrind testing error
@pcmoritz
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deleted the

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May 14, 2018 08:19
@pitrou
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This PR is constructing a generator with a fixed seed, so now distinct processes will trivially collide when generate random ids:
$ python -c "from pyarrow import plasma; print(plasma.ObjectID.from_random())"
ObjectID(d022e7d520f8e938a14e188c47308cfef5fff7f7)
$ python -c "from pyarrow import plasma; print(plasma.ObjectID.from_random())"
ObjectID(d022e7d520f8e938a14e188c47308cfef5fff7f7)

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I just saw this and opened a JIRA here: https://issues.apache.org/jira/browse/ARROW-3018
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
ARROW-2578: [Plasma] Use mersenne twister to generate random number - #2039
Closed
pcmoritz wants to merge 8 commits into
apache:masterfrom 
pcmoritz:new-rng
Closed
ARROW-2578: [Plasma] Use mersenne twister to generate random number#2039
pcmoritz wants to merge 8 commits into
apache:masterfrom 
pcmoritz:new-rng
Conversation
@pcmoritz
@pcmoritzpcmoritz
commented
May 14, 2018•

edited

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This gets rid of the std::random_device, which is slow and causes errors in valgrind. Instead we use the std::mt19937 Mersenne Twister.
@pcmoritzpcmoritz
changed the title
ARROW-2578: Use mersenne twister to generate random numberARROW-2578: [Plasma] Use mersenne twister to generate random numberMay 14, 2018
@codecov-io
codecov-io
commented
May 14, 2018•

edited

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Codecov Report
Merging #2039 into master will increase coverage by 1.19%.

The diff coverage is 100%.
Impacted file tree graph
@@ Coverage Diff @@## master #2039 +/- ##
==========================================
+ Coverage 86.28% 87.48% +1.19% 
==========================================
Files 11 178 +167 Lines 773 28595 +27822 ==========================================
+ Hits 667 25015 +24348 - Misses 106 3580 +3474
Impacted FilesCoverage Δ
cpp/src/plasma/test/client_tests.cc100% <100%> (ø)
cpp/src/plasma/common.cc94.11% <100%> (ø)
rust/src/lib.rs
rust/src/memory.rs
rust/src/error.rs
rust/src/list_builder.rs
rust/src/bitmap.rs
rust/src/array.rs
rust/src/datatypes.rs
rust/src/memory_pool.rs
... and 181 more
Continue to review full report at Codecov.
Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data

Powered by Codecov. Last update 19af862...21d0e3f. Read the comment docs.
robertnishihara
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reviewed
May 14, 2018
View reviewed changes
Comment threadcpp/src/plasma/common.cc
Outdated

#include <limits>
#include <mutex>
#include <random>
#include <thread>
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Is this still needed?
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fixed
robertnishihara
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May 14, 2018
View reviewed changes
Comment threadcpp/src/plasma/common.cc
Outdated

 static std::mutex mutex;
 std::lock_guard<std::mutex> lock(mutex);
 static std::mt19937 generator;
 std::uniform_int_distribution<uint32_t> d(0, std::numeric_limits<uint8_t>::max());
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minor, but I'm not a huge fan of the variable name d
@pcmoritzpcmoritzMay 14, 2018

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fixed
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+1 merging this now to remove the valgrind testing error
@pcmoritz
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deleted the

new-rng

branch
May 14, 2018 08:19
@pitrou
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May 16, 2018

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This PR is constructing a generator with a fixed seed, so now distinct processes will trivially collide when generate random ids:
$ python -c "from pyarrow import plasma; print(plasma.ObjectID.from_random())"
ObjectID(d022e7d520f8e938a14e188c47308cfef5fff7f7)
$ python -c "from pyarrow import plasma; print(plasma.ObjectID.from_random())"
ObjectID(d022e7d520f8e938a14e188c47308cfef5fff7f7)

@pcmoritz
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Aug 7, 2018

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I just saw this and opened a JIRA here: https://issues.apache.org/jira/browse/ARROW-3018
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

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ARROW-2578: [Plasma] Use mersenne twister to generate random number - #2039
Closed
pcmoritz wants to merge 8 commits into
apache:masterfrom 
pcmoritz:new-rng
Closed
ARROW-2578: [Plasma] Use mersenne twister to generate random number#2039
pcmoritz wants to merge 8 commits into
apache:masterfrom 
pcmoritz:new-rng
Conversation
@pcmoritz
@pcmoritzpcmoritz
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May 14, 2018•

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This gets rid of the std::random_device, which is slow and causes errors in valgrind. Instead we use the std::mt19937 Mersenne Twister.
@pcmoritzpcmoritz
changed the title
ARROW-2578: Use mersenne twister to generate random numberARROW-2578: [Plasma] Use mersenne twister to generate random numberMay 14, 2018
@codecov-io
codecov-io
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May 14, 2018•

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Codecov Report
Merging #2039 into master will increase coverage by 1.19%.

The diff coverage is 100%.
Impacted file tree graph
@@ Coverage Diff @@## master #2039 +/- ##
==========================================
+ Coverage 86.28% 87.48% +1.19% 
==========================================
Files 11 178 +167 Lines 773 28595 +27822 ==========================================
+ Hits 667 25015 +24348 - Misses 106 3580 +3474
Impacted FilesCoverage Δ
cpp/src/plasma/test/client_tests.cc100% <100%> (ø)
cpp/src/plasma/common.cc94.11% <100%> (ø)
rust/src/lib.rs
rust/src/memory.rs
rust/src/error.rs
rust/src/list_builder.rs
rust/src/bitmap.rs
rust/src/array.rs
rust/src/datatypes.rs
rust/src/memory_pool.rs
... and 181 more
Continue to review full report at Codecov.
Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data

Powered by Codecov. Last update 19af862...21d0e3f. Read the comment docs.
robertnishihara
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reviewed
May 14, 2018
View reviewed changes
Comment threadcpp/src/plasma/common.cc
Outdated

#include <limits>
#include <mutex>
#include <random>
#include <thread>
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Is this still needed?
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fixed
robertnishihara
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May 14, 2018
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Comment threadcpp/src/plasma/common.cc
Outdated

 static std::mutex mutex;
 std::lock_guard<std::mutex> lock(mutex);
 static std::mt19937 generator;
 std::uniform_int_distribution<uint32_t> d(0, std::numeric_limits<uint8_t>::max());
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minor, but I'm not a huge fan of the variable name d
@pcmoritzpcmoritzMay 14, 2018

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fixed
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+1 merging this now to remove the valgrind testing error
@pcmoritz
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deleted the

new-rng

branch
May 14, 2018 08:19
@pitrou
pitrou
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May 16, 2018

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This PR is constructing a generator with a fixed seed, so now distinct processes will trivially collide when generate random ids:
$ python -c "from pyarrow import plasma; print(plasma.ObjectID.from_random())"
ObjectID(d022e7d520f8e938a14e188c47308cfef5fff7f7)
$ python -c "from pyarrow import plasma; print(plasma.ObjectID.from_random())"
ObjectID(d022e7d520f8e938a14e188c47308cfef5fff7f7)

@pcmoritz
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Aug 7, 2018

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I just saw this and opened a JIRA here: https://issues.apache.org/jira/browse/ARROW-3018
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