[PATCH] makedumpfile: Improve performance for parallel compression with zlib.

[qiaonuohan]

Hello Zhou,

The performance improvement shows great according to your data. However,
the data is not that enough to show the change of common use.

Since the amount of 0/1 in a page will cause the vary of time used for
compression, I would like you get more benchmark on different core with
different amount of 0/1.

On 10/22/2015 11:11 AM, "Zhou, Wenjian/周文?" wrote:
> Hello Kumagai,
>
> I test it, and it works well. The following is the results.
>
> in virtual machine(memory 2G):
> with empty memory:
>            version      |  num-threads  |  time(sec)
>         ----------------+---------------+-------------
>              devel      |       0       |    12.76
>              devel      |       1       |    19.29
>              devel      |       2       |    11.56
>          + this patch   |       0       |    12.85
>          + this patch   |       1       |     5.61
>          + this patch   |       2       |     2.68
>
> with full memory:

full memory means memory is occupied by 1, without 0?

>            version      |  num-threads  |  time(sec)
>         ----------------+---------------+-------------
>              devel      |       0       |    51.18
>              devel      |       1       |    57.82
>              devel      |       2       |    41.54
>          + this patch   |       0       |    49.25
>          + this patch   |       1       |    44.80
>          + this patch   |       2       |    33.87
>
>
> in real machine(memory 16G):
> with empty memory:
>            version      |  num-threads  |  time(sec)
>         ----------------+---------------+-------------
>              devel      |       0       |    86.12
>              devel      |       1       |   222.37
>              devel      |       8       |    81.50
>              devel      |       16      |    98.44
>          + this patch   |       0       |    86.07
>          + this patch   |       1       |    84.33
>          + this patch   |       8       |    14.95
>          + this patch   |       16      |    13.96
>
> with full memory:
>            version      |  num-threads  |  time(sec)
>         ----------------+---------------+-------------
>              devel      |       0       |   540.89
>              devel      |       1       |   715.25
>              devel      |       8       |   132.54
>              devel      |       16      |   112.89
>          + this patch   |       0       |   542.79
>          + this patch   |       1       |   538.22
>          + this patch   |       8       |   108.28
>          + this patch   |       16      |   107.83
>


-- 
Regards
Qiao Nuohan