[PATCH RFC 00/11] makedumpfile: parallel processing

[Dave Young]

Hi,

On 12/02/15 at 01:29pm, "Zhou, Wenjian/周文剑" wrote:
> I think there is no problem if other test results are as expected.
> 
> --num-threads mainly reduces the time of compressing.
> So for lzo, it can't do much help at most of time.

Seems the help of --num-threads does not say it exactly:

  [--num-threads THREADNUM]:
      Using multiple threads to read and compress data of each page in parallel.
      And it will reduces time for saving DUMPFILE.
      This feature only supports creating DUMPFILE in kdump-comressed format from
      VMCORE in kdump-compressed format or elf format.

Lzo is also a compress method, it should be mentioned that --num-threads only
supports zlib compressed vmcore.

Also worth to mention about the recommended -d value for this feature.

Thanks
Dave