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From: Tatsuo Ishii <[email protected]>
To: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Subject: Re: many sessions waiting DataFileRead and extend
Date: Thu, 26 Jun 2025 12:25:45 +0900 (JST)
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
	<CAHgTRfff0+i4PV_9G-fAREdDcMi4J1StcCDG6NcJ=hGhT2-SvQ@mail.gmail.com>
	<[email protected]>

> On Thu, 2025-06-26 at 10:32 +0800, James Pang wrote:
>> thans for you suggestions, we have iowait from sar command too, copy here, checking with infra team not found abnormal IO activities either.  
>> 02:00:01 PM  CPU    %usr   %nice    %sys %iowait    %irq   %soft  %steal  %guest  %gnice   %idle
>> 02:00:03 PM  all   15.92    0.00   43.02    0.65    0.76    2.56    0.00    0.00    0.00   37.09
> 
> Crazy high system time.
> 
> If it is not transparent hugepages, the other suspect is fork().

Can we use starce -S to collect system call statistics to find out
which system call is taking time?

Best regards,
--
Tatsuo Ishii
SRA OSS K.K.
English: http://www.sraoss.co.jp/index_en/
Japanese:http://www.sraoss.co.jp

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