From: ylhsieh@mxic.com.tw
To: fio@vger.kernel.org
Subject: fio output percentile latency seems upper bounded
Date: Tue, 16 Apr 2024 16:55:56 +0800 [thread overview]
Message-ID: <OFA9096527.7152DEBE-ON48258B01.0030FF36-48258B01.003110F5@mxic.com.tw> (raw)
Hi, there
In fio output, sometimes I see tail percentile latency to be 17112760320,
and it remains this value to 99.99%, why? Also, the mean latency is larger
than this value? (intuitively, tail latency should be larger than mean
latency...?) What's the reason and how to make it reasonable?
"clat_ns" : {
...
"mean" : 41081227631.728256,
...
"percentile" : {
"1.000000" : 1669332992,
"5.000000" : 10536091648,
"10.000000" : 17112760320,
"20.000000" : 17112760320,
...
"99.950000" : 17112760320,
"99.990000" : 17112760320
}
},
"lat_ns" : {
...
"mean" : 41087031313.177292,
...
}
Thank you
YL
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next reply other threads:[~2024-04-16 8:56 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-16 8:55 ylhsieh [this message]
2024-04-16 15:25 ` fio output percentile latency seems upper bounded Vincent Fu
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