#1859: Average Hitrate Reported by Varnishstat Inaccurate
---------------------------------+-------------------------
Reporter: batty | Type: defect
Status: new | Priority: normal
Milestone: | Component: varnishstat
Version: 4.1.1 | Severity: normal
Keywords: varnishtat hit rate |
---------------------------------+-------------------------
We're in the process of upgrading from varnish 3.0.3 to varnish 4.1.1.
During the upgrade it was noticed that the average hit rate reported by
varnishstat in 4.1.1 does not match the hit rate calculated from the
individual hit/miss metrics. We have two servers running, one still on
version 3.0.3 and one updated to version 4.1.1. I restarted both servers
at roughly the same time and immediately began running varnishstat each.
The average hit rate according to varnish 4.1.1 is: 0.2465 0.3085
0.3127[[br]]
The average hit rate according to varnish 3.0.3 is: 0.6592 0.6402
0.6182
Here is a varnishstat -1 dump from each server:[[br]]
varnishstat -1 4.1.1: http://pastebin.com/tP5AE995 [[br]]
varnishstat -1 3.0.3: http://pastebin.com/cg51CuUS
Relevant metrics from 4.1.1:
{{{
MAIN.cache_hit 47970 20.23 Cache hits
MAIN.cache_miss 22402 9.45 Cache misses
}}}
Relevant metrics from 3.0.3:
{{{
cache_hit 46306 19.81 Cache hits
cache_miss 23223 9.94 Cache misse
}}}
From what I understand hit rate is calculated as cache_hit / (cache_hit +
cache_miss) so...
For varnish 4.1.1:[[br]]
47970 / (47970 + 22402) = .6816
For varnish 3.0.3:[[br]]
46306 / (46306 + 23223) = .6659
Both of these calculations correspond roughly to the average hit rate
being reported by varnishstat in 3.0.3, however varnish 4.1.1 is reporting
the much lower (0.2465 0.3085 0.3127).
Is the hit rate being reported by varnishtat calculated differently in
4.1.1? I reported this the IRC channel and it was suggested I file a
ticket.
--
Ticket URL: <https://www.varnish-cache.org/trac/ticket/1859>
Varnish <https://varnish-cache.org/>
The Varnish HTTP Accelerator
_______________________________________________
varnish-bugs mailing list
varnish-bugs@varnish-cache.org
https://www.varnish-cache.org/lists/mailman/listinfo/varnish-bugs
---------------------------------+-------------------------
Reporter: batty | Type: defect
Status: new | Priority: normal
Milestone: | Component: varnishstat
Version: 4.1.1 | Severity: normal
Keywords: varnishtat hit rate |
---------------------------------+-------------------------
We're in the process of upgrading from varnish 3.0.3 to varnish 4.1.1.
During the upgrade it was noticed that the average hit rate reported by
varnishstat in 4.1.1 does not match the hit rate calculated from the
individual hit/miss metrics. We have two servers running, one still on
version 3.0.3 and one updated to version 4.1.1. I restarted both servers
at roughly the same time and immediately began running varnishstat each.
The average hit rate according to varnish 4.1.1 is: 0.2465 0.3085
0.3127[[br]]
The average hit rate according to varnish 3.0.3 is: 0.6592 0.6402
0.6182
Here is a varnishstat -1 dump from each server:[[br]]
varnishstat -1 4.1.1: http://pastebin.com/tP5AE995 [[br]]
varnishstat -1 3.0.3: http://pastebin.com/cg51CuUS
Relevant metrics from 4.1.1:
{{{
MAIN.cache_hit 47970 20.23 Cache hits
MAIN.cache_miss 22402 9.45 Cache misses
}}}
Relevant metrics from 3.0.3:
{{{
cache_hit 46306 19.81 Cache hits
cache_miss 23223 9.94 Cache misse
}}}
From what I understand hit rate is calculated as cache_hit / (cache_hit +
cache_miss) so...
For varnish 4.1.1:[[br]]
47970 / (47970 + 22402) = .6816
For varnish 3.0.3:[[br]]
46306 / (46306 + 23223) = .6659
Both of these calculations correspond roughly to the average hit rate
being reported by varnishstat in 3.0.3, however varnish 4.1.1 is reporting
the much lower (0.2465 0.3085 0.3127).
Is the hit rate being reported by varnishtat calculated differently in
4.1.1? I reported this the IRC channel and it was suggested I file a
ticket.
--
Ticket URL: <https://www.varnish-cache.org/trac/ticket/1859>
Varnish <https://varnish-cache.org/>
The Varnish HTTP Accelerator
_______________________________________________
varnish-bugs mailing list
varnish-bugs@varnish-cache.org
https://www.varnish-cache.org/lists/mailman/listinfo/varnish-bugs