94b37aac06
Adds a sampleRate parameter to the profile command, a value on the interval [0, 1] which indicates which fraction of operations should be randomly sampled for profiling and logging. This allows users to reduce their slowms threshold or increase their profiling level with less performance impact on the system. Closes #1099 Signed-off-by: David Storch <david.storch@10gen.com>
52 lines
1.8 KiB
JavaScript
52 lines
1.8 KiB
JavaScript
// Confirms that the number of profiled operations is consistent with the sampleRate, if set.
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(function() {
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"use strict";
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// Use a special db to support running other tests in parallel.
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var profileDB = db.getSisterDB("profile_sampling");
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var coll = profileDB.profile_sampling;
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profileDB.dropDatabase();
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var originalProfilingSettings;
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try {
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originalProfilingSettings = assert.commandWorked(profileDB.setProfilingLevel(0));
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profileDB.system.profile.drop();
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assert.eq(0, profileDB.system.profile.count());
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profileDB.createCollection(coll.getName());
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assert.writeOK(coll.insert({x: 1}));
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assert.commandWorked(profileDB.setProfilingLevel(2, {sampleRate: 0}));
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assert.neq(null, coll.findOne({x: 1}));
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assert.eq(1, coll.find({x: 1}).count());
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assert.writeOK(coll.update({x: 1}, {$inc: {a: 1}}));
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profileDB.setProfilingLevel(0);
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profileDB.system.profile.find().forEach(printjson);
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assert.eq(0, profileDB.system.profile.count());
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profileDB.system.profile.drop();
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assert.commandWorked(profileDB.setProfilingLevel(2, {sampleRate: 0.5}));
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// This should generate about 500 profile log entries.
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for (var i = 0; i < 500; i++) {
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assert.neq(null, coll.findOne({x: 1}));
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assert.writeOK(coll.update({x: 1}, {$inc: {a: 1}}));
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}
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profileDB.setProfilingLevel(0);
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assert.between(10, profileDB.system.profile.count(), 990);
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} finally {
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let profileCmd = {};
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profileCmd.profile = originalProfilingSettings.was;
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profileCmd = Object.extend(profileCmd, originalProfilingSettings);
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delete profileCmd.was;
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delete profileCmd.ok;
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assert.commandWorked(profileDB.runCommand(profileCmd));
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}
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}());
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