Hello, The COS performance testing plan currently contains only few items: 1. parallel creates from two mountpoints in different directories (COS should add no overhead, there are not dependent transactions) 2. parallel creates from two mountpoints in one shared directory (COS should add no overhead due to parallel dir operations and hashed directory locks) 3. create files from one mountpoint and delete from another mountpoint, the test program is attached to the bug. (this really measures COS overhead) The latest test is a corner case when all transactions are dependent. Would be better to have more complex tests with a mix of dependent and independent operations and more clients? BTW, I have preliminary test results, elapsed time and number of disk transactions for the performance tests: TEST | COS OFF | COS ON ---------------------------------------------- 1. 2 clients create | 24.55 sec | 25.06 sec 10000 files each | 166 trans | 154 trans in own directories | | | | 2. 2 clients, | 30.46 sec | 25.01 sec 2x10000 files, | 206 trans | 157 trans one shared dir | | | | 3. create / delete | 39.28 sec | 38.84 sec of 10000 files | 92 trans | 10462 trans the tests are done on my home two-cores machine with 1G RAM, SATA HDD but CPU clock was throttled due to high CPU temperature, so the results are not very stable. Thanks, -- Alexander "Zam" Zarochentsev Staff Engineer Lustre Group, Sun Microsystems