mongodb/jstests/parallel/manyclients.js

// perform inserts in parallel from a large number of clients
load('jstests/libs/parallelTester.js')

f = db.jstests_parallel_manyclients;
f.drop();
f.ensureIndex( {who:1} );

Random.setRandomSeed();

t = new ParallelTester();

// v8 uses about 30M (res) per thread, so can't do many more on an 8GB system
numThreads = 125;
buildInfo = db.adminCommand( "buildInfo" )

if ( buildInfo.bits < 64 ||
     buildInfo.sysInfo.indexOf( "Linux" ) < 0 ||
     buildInfo.debug ) {
    numThreads = 50;
}

numThreads = Math.min( numThreads, db.serverStatus().connections.available / 3 );

print( "numThreads: " + numThreads );

for( id = 0; id < numThreads; ++id ) {
    var g = new EventGenerator( id, "jstests_parallel_manyclients", Random.randInt( 20 ) );
    for( j = 0; j < 1000; ++j ) {
        if ( j % 50 == 0 ) {
            g.addCheckCount( j, {who:id}, false );
        }
        g.addInsert( { i:j, who:id } );
    }
    t.add( EventGenerator.dispatch, g.getEvents() );
}

print( "done preparing test" );

t.run( "one or more tests failed" );

assert( f.validate().valid );