jstests/disk/preallocate.js


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// check that there is preallocation, and there are 2 files

var baseName = "jstests_preallocate";

var m = MongoRunner.runMongod({});

var getTotalNonLocalSize = function() {
    var totalNonLocalDBSize = 0;
    m.getDBs().databases.forEach( function(dbStats) {
        // We accept the local database's space overhead.
        if (dbStats.name == "local") return;

        // Databases with "sizeOnDisk=1" and "empty=true" dont' actually take up space o disk.
        // See SERVER-11051.
        if (dbStats.sizeOnDisk == 1 && dbStats.empty) return;
        totalNonLocalDBSize += dbStats.sizeOnDisk;
    });
    return totalNonLocalDBSize;
}

assert.eq( 0, getTotalNonLocalSize() );

m.getDB( baseName ).createCollection( baseName + "1" );

// Windows does not currently use preallocation
expectedMB = 64 + 16;
if ( m.getDB( baseName ).serverBits() < 64 )
    expectedMB /= 4;

assert.soon(function() { return getTotalNonLocalSize() >= expectedMB * 1024 * 1024; },
            "\n\n\nFAIL preallocate.js expected second file to bring total size over " +
            expectedMB + "MB" );

MongoRunner.stopMongod(m);

m = MongoRunner.runMongod({restart: true, cleanData: false, dbpath: m.dbpath});

size = getTotalNonLocalSize();

m.getDB( baseName ).createCollection( baseName + "2" );

sleep( 2000 ); // give prealloc a chance

assert.eq( size, getTotalNonLocalSize() );