On 8/1/13 17:04 , "Jens Axboe" wrote:
>On 08/01/2013 02:28 PM, Tomoki Sekiyama wrote:
>> On 7/30/13 10:09 PM, Shaohua Li wrote:
>>> On Tue, Jul 30, 2013 at 03:30:33PM -0400, Tomoki Sekiyama wrote:
Hi,
When some application launches several hundreds of processes that
issue
On 8/1/13 17:04 , Jens Axboe ax...@kernel.dk wrote:
On 08/01/2013 02:28 PM, Tomoki Sekiyama wrote:
On 7/30/13 10:09 PM, Shaohua Li wrote:
On Tue, Jul 30, 2013 at 03:30:33PM -0400, Tomoki Sekiyama wrote:
Hi,
When some application launches several hundreds of processes that
issue
only a few
On 08/01/2013 02:28 PM, Tomoki Sekiyama wrote:
> On 7/30/13 10:09 PM, Shaohua Li wrote:
>> On Tue, Jul 30, 2013 at 03:30:33PM -0400, Tomoki Sekiyama wrote:
>>> Hi,
>>>
>>> When some application launches several hundreds of processes that issue
>>> only a few small sync I/O requests, CFQ may cause
On 7/30/13 10:09 PM, Shaohua Li wrote:
> On Tue, Jul 30, 2013 at 03:30:33PM -0400, Tomoki Sekiyama wrote:
>> Hi,
>>
>> When some application launches several hundreds of processes that issue
>> only a few small sync I/O requests, CFQ may cause heavy latencies
>> (10+ seconds at the worst case),
On 7/30/13 10:09 PM, Shaohua Li wrote:
On Tue, Jul 30, 2013 at 03:30:33PM -0400, Tomoki Sekiyama wrote:
Hi,
When some application launches several hundreds of processes that issue
only a few small sync I/O requests, CFQ may cause heavy latencies
(10+ seconds at the worst case), although the
On 08/01/2013 02:28 PM, Tomoki Sekiyama wrote:
On 7/30/13 10:09 PM, Shaohua Li wrote:
On Tue, Jul 30, 2013 at 03:30:33PM -0400, Tomoki Sekiyama wrote:
Hi,
When some application launches several hundreds of processes that issue
only a few small sync I/O requests, CFQ may cause heavy latencies
On Tue, Jul 30, 2013 at 03:30:33PM -0400, Tomoki Sekiyama wrote:
> Hi,
>
> When some application launches several hundreds of processes that issue
> only a few small sync I/O requests, CFQ may cause heavy latencies
> (10+ seconds at the worst case), although the request rate is low enough for
>
Hi,
When some application launches several hundreds of processes that issue
only a few small sync I/O requests, CFQ may cause heavy latencies
(10+ seconds at the worst case), although the request rate is low enough for
the disk to handle it without waiting. This is because CFQ waits for
Hi,
When some application launches several hundreds of processes that issue
only a few small sync I/O requests, CFQ may cause heavy latencies
(10+ seconds at the worst case), although the request rate is low enough for
the disk to handle it without waiting. This is because CFQ waits for
On Tue, Jul 30, 2013 at 03:30:33PM -0400, Tomoki Sekiyama wrote:
Hi,
When some application launches several hundreds of processes that issue
only a few small sync I/O requests, CFQ may cause heavy latencies
(10+ seconds at the worst case), although the request rate is low enough for
the
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