Messages in this thread | | | Date | Fri, 26 Jul 2013 19:42:39 +0800 | From | Jingbai Ma <> | Subject | makedumpfile 1.5.4 + kernel 3.11-rc2+ 4TB tests |
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Hi,
I have run some tests with makedumpfile 1.5.4 and upstream kernel 3.11-rc2+ on a machine with 4TB memory, here is testing results:
Test environment: Machine: HP ProLiant DL980 G7 with 4TB RAM. CPU: Intel(R) Xeon(R) CPU E7- 2860 @ 2.27GHz (8 sockets, 10 cores) (Only 1 CPU was enabled the 2nd kernel) Kernel: 3.11.0-rc2+ (at patch b3a3a9c441e2c8f6b6760de9331023a7906a4ac6) crashkernel=384MB vmcore size: 4.0TB Dump file size: 15GB All measured time from debug message of makedumpfile. As a comparison, I also have tested makedumpfile 1.5.3.
(all time in seconds) Excluding pages Copy data Total makedumpfile 1.5.3 468 1182 1650 makedumpfile 1.5.4 93 518 611
So it seems there is a great performance improvement by the mmap mechanism.
-- Thanks, Jingbai Ma
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