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Subjectmakedumpfile mmap() benchmark
Hi,

I have tested the makedumpfile mmap patch on a machine with 2TB memory,
here is testing results:
Test environment:
Machine: HP ProLiant DL980 G7 with 2TB RAM.
CPU: Intel(R) Xeon(R) CPU E7- 2860 @ 2.27GHz (8 sockets, 10 cores)
(Only 1 cpu was enabled the 2nd kernel)
Kernel: 3.9.0-rc3+ with mmap kernel patch v3
vmcore size: 2.0TB
Dump file size: 3.6GB
makedumpfile mmap branch with parameters: -c --message-level 23 -d 31
--map-size <map-size>
All measured time from debug message of makedumpfile.

As a comparison, I also have tested with original kernel and original
makedumpfile 1.5.1 and 1.5.3.
I added all [Excluding unnecessary pages] and [Excluding free pages]
time together as "Filter Pages", and [Copyying Data] as "Copy data" here.

makedumjpfile Kernel map-size (KB) Filter pages (s) Copy data (s) Total (s)
1.5.1 3.7.0-0.36.el7.x86_64 N/A 940.28 1269.25 2209.53
1.5.3 3.7.0-0.36.el7.x86_64 N/A 380.09 992.77 1372.86
1.5.3 v3.9-rc3 N/A 197.77 892.27 1090.04
1.5.3+mmap v3.9-rc3+mmap 0 164.87 606.06 770.93
1.5.3+mmap v3.9-rc3+mmap 4 88.62 576.07 664.69
1.5.3+mmap v3.9-rc3+mmap 1024 83.66 477.23 560.89
1.5.3+mmap v3.9-rc3+mmap 2048 83.44 477.21 560.65
1.5.3+mmap v3.9-rc3+mmap 10240 83.84 476.56 560.4


Thanks,
Jingbai Ma


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