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Type: Bug
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Resolution: Done
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Priority: Major - P3
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None
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Affects Version/s: 3.0.0
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Component/s: MMAPv1, Storage, WiredTiger
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Fully Compatible
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ALL
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Problem
Using sysbench to load 16M documents (in 16 collections) and then execute a 10 minute workload results in very different storage usage. WiredTiger uses 5GB, MMAPv1 20GB. The substantial difference is in the journal directory 1.8 GB(WT) versus 16GB (MMAPv1).
wiredTiger
alvin@bismark:/data-nfs/db$ du -sh 5.0G . 16K collection-0--6859785001528658125.wt 186M collection-11--6859785001528658125.wt 186M collection-14--6859785001528658125.wt 186M collection-17--6859785001528658125.wt 186M collection-20--6859785001528658125.wt 186M collection-23--6859785001528658125.wt 186M collection-26--6859785001528658125.wt 186M collection-2--6859785001528658125.wt 186M collection-29--6859785001528658125.wt 186M collection-32--6859785001528658125.wt 186M collection-35--6859785001528658125.wt 186M collection-38--6859785001528658125.wt 186M collection-41--6859785001528658125.wt 186M collection-44--6859785001528658125.wt 186M collection-47--6859785001528658125.wt 186M collection-5--6859785001528658125.wt 186M collection-8--6859785001528658125.wt 9.0M index-10--6859785001528658125.wt 9.8M index-12--6859785001528658125.wt 8.9M index-13--6859785001528658125.wt 9.8M index-15--6859785001528658125.wt 8.8M index-16--6859785001528658125.wt 16K index-1--6859785001528658125.wt 9.8M index-18--6859785001528658125.wt 9.0M index-19--6859785001528658125.wt 9.8M index-21--6859785001528658125.wt 9.0M index-22--6859785001528658125.wt 9.8M index-24--6859785001528658125.wt 9.0M index-25--6859785001528658125.wt 9.8M index-27--6859785001528658125.wt 9.1M index-28--6859785001528658125.wt 9.8M index-30--6859785001528658125.wt 9.1M index-31--6859785001528658125.wt 9.8M index-33--6859785001528658125.wt 9.1M index-34--6859785001528658125.wt 9.8M index-36--6859785001528658125.wt 9.8M index-3--6859785001528658125.wt 9.1M index-37--6859785001528658125.wt 9.8M index-39--6859785001528658125.wt 9.0M index-40--6859785001528658125.wt 9.8M index-42--6859785001528658125.wt 9.1M index-43--6859785001528658125.wt 9.8M index-45--6859785001528658125.wt 9.1M index-46--6859785001528658125.wt 8.9M index-4--6859785001528658125.wt 9.8M index-48--6859785001528658125.wt 9.1M index-49--6859785001528658125.wt 9.8M index-6--6859785001528658125.wt 9.0M index-7--6859785001528658125.wt 9.8M index-9--6859785001528658125.wt 1.8G journal 16K _mdb_catalog.wt 0 mongod.lock 32K sizeStorer.wt 4.0K storage.bson 12K _tmp 0 WiredTiger 4.0K WiredTiger.basecfg 0 WiredTiger.lock 4.0K WiredTiger.turtle 164K WiredTiger.wt
MMAPv1
== MMAP alvin@bismark:/data-nfs/db$ du -sh 20G . alvin@bismark:/data-nfs/db$ du -sh * 16G journal 52K local.0 17M local.ns 0 mongod.lock 63M sbtest.0 121M sbtest.1 254M sbtest.2 502M sbtest.3 1003M sbtest.4 2.0G sbtest.5 898M sbtest.6 37M sbtest.7 17M sbtest.ns 4.0K storage.bson 4.0K _tmp