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Re: [Qemu-devel] [PING PING PING] [PATCH 0/3] migration: add sztd compre
From: |
Denis Plotnikov |
Subject: |
Re: [Qemu-devel] [PING PING PING] [PATCH 0/3] migration: add sztd compression |
Date: |
Thu, 25 Apr 2019 16:17:13 +0000 |
On 05.04.2019 14:40, Denis Plotnikov wrote:
> ping!
>
> On 26.03.2019 18:51, Denis Plotnikov wrote:
>> ping ping ping ping ping!
>>
>> On 18.03.2019 10:53, Denis Plotnikov wrote:
>>> ping ping ping ping!
>>>
>>> On 11.03.2019 11:20, Denis Plotnikov wrote:
>>>> ping ping ping!
>>>>
>>>> On 04.03.2019 18:10, Denis Plotnikov wrote:
>>>>> ping!
>>>>>
>>>>> On 26.02.2019 16:15, Denis Plotnikov wrote:
>>>>>> zstd date compression algorithm shows better performance on data
>>>>>> compression.
>>>>>> It might be useful to employ the algorithm in VM migration to
>>>>>> reduce CPU usage.
>>>>>> A user will be able to choose between those algorithms, therefor
>>>>>> compress-type
>>>>>> migration parameter is added.
>>>>>>
>>>>>> Here are some results of performance comparison zstd vs gzip:
>>>>>>
>>>>>> host: i7-4790 8xCPU @ 3.60GHz, 16G RAM
>>>>>> migration to the same host
>>>>>> VM: 2xVCPU, 8G RAM total
>>>>>> 5G RAM used, memory populated with postgreqsl data
>>>>>> produced by pgbench performance benchmark
>>>>>>
>>>>>>
>>>>>> Threads: 1 compress – 1 decompress
>>>>>>
>>>>>> zstd provides slightly less compression ratio with almost the same
>>>>>> CPU usage but copes with RAM compression roghly 2 times faster
>>>>>>
>>>>>> compression type zlib | zstd
>>>>>> ---------------------------------------------------------
>>>>>> compression level 1 5 | 1 5
>>>>>> compression ratio 6.92 7.05 | 6.69 6.89
>>>>>> cpu idle, % 82 83 | 86 80
>>>>>> time, sec 49 71 | 26 31
>>>>>> time diff to zlib, sec -25 -41
>>>>>>
>>>>>>
>>>>>> Threads: 8 compress – 2 decompress
>>>>>>
>>>>>> zstd provides the same migration time with less cpu consumption
>>>>>>
>>>>>> compression type none | gzip(zlib) | zstd
>>>>>> ------------------------------------------------------------------------------
>>>>>>
>>>>>>
>>>>>> compression level - | 1 5 9 | 1
>>>>>> 5 15
>>>>>> compression ratio - | 6.94 6.99 7.14 | 6.64
>>>>>> 6.89 6.93
>>>>>> time, sec 154 | 22 23 27 | 23
>>>>>> 23 25
>>>>>> cpu idle, % 99 | 45 30 12 | 70
>>>>>> 52 23
>>>>>> cpu idle diff to zlib | | -25%
>>>>>> -22% -11%
>>>>>>
>>>>>>
>>>>>> Denis Plotnikov (3):
>>>>>> migration: rework compression code for adding more data
>>>>>> compressors
>>>>>> hmp: add compress-type parameter to migration parameters
>>>>>> migration: add zstd compression
>>>>>>
>>>>>> configure | 26 ++++
>>>>>> hmp.c | 8 ++
>>>>>> migration/migration.c | 45 ++++++-
>>>>>> migration/migration.h | 1 +
>>>>>> migration/qemu-file.c | 39 ++----
>>>>>> migration/qemu-file.h | 18 ++-
>>>>>> migration/ram.c | 291
>>>>>> ++++++++++++++++++++++++++++++++++--------
>>>>>> qapi/migration.json | 26 +++-
>>>>>> 8 files changed, 369 insertions(+), 85 deletions(-)
>>>>>>
>>>>>
>>>>
>>>
>>
>
--
Best,
Denis