How to measure the usage of disk cache?
Clash Royale CLAN TAG#URR8PPP
Load Average itself is not very informative about the reasons of overload, so I want an additional characteristic: the percent of disk read operations that are done from cache. To measure it, I probably need:
- the amount of data read from cache (or, instead, the amount of data read directly from disk);
- the total amount of read data.
Both for the certain period of time, f.e., 1 second.
Is this information available in procfs/sysfs?
hard-disk disk-usage proc cache load
asked Dec 11 at 15:51
bodqhrohro
27116
add a comment |
Load Average itself is not very informative about the reasons of overload, so I want an additional characteristic: the percent of disk read operations that are done from cache. To measure it, I probably need:
- the amount of data read from cache (or, instead, the amount of data read directly from disk);
- the total amount of read data.
Both for the certain period of time, f.e., 1 second.
Is this information available in procfs/sysfs?
hard-disk disk-usage proc cache load
asked Dec 11 at 15:51
bodqhrohro
27116
add a comment |
Load Average itself is not very informative about the reasons of overload, so I want an additional characteristic: the percent of disk read operations that are done from cache. To measure it, I probably need:
- the amount of data read from cache (or, instead, the amount of data read directly from disk);
- the total amount of read data.
Both for the certain period of time, f.e., 1 second.
Is this information available in procfs/sysfs?
hard-disk disk-usage proc cache load
asked Dec 11 at 15:51
bodqhrohro
27116
Load Average itself is not very informative about the reasons of overload, so I want an additional characteristic: the percent of disk read operations that are done from cache. To measure it, I probably need:
- the amount of data read from cache (or, instead, the amount of data read directly from disk);
- the total amount of read data.
Both for the certain period of time, f.e., 1 second.
Is this information available in procfs/sysfs?
hard-disk disk-usage proc cache load
hard-disk disk-usage proc cache load
asked Dec 11 at 15:51
bodqhrohro
27116
asked Dec 11 at 15:51
bodqhrohro
27116
asked Dec 11 at 15:51
bodqhrohro
27116
asked Dec 11 at 15:51
bodqhrohro
27116
asked Dec 11 at 15:51
bodqhrohro
27116
27116
add a comment |
add a comment |
1 Answer
1
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oldest
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Use cachestat-perf from perf-tools.
# cachestat-perf
Counting cache functions... Output every 1 seconds.
HITS MISSES DIRTIES RATIO BUFFERS_MB CACHE_MB
2086 47 0 97.8% 5 541
1952 0 0 100.0% 5 541
1851 0 0 100.0% 5 541
1904 0 0 100.0% 5 541
1903 0 0 100.0% 5 541
answered Dec 11 at 17:01
Ipor Sircer
10.5k11024
Needs a custom kernel withCONFIG_FUNCTION_PROFILERenabled :(
– bodqhrohro
Dec 12 at 1:13
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
Use cachestat-perf from perf-tools.
# cachestat-perf
Counting cache functions... Output every 1 seconds.
HITS MISSES DIRTIES RATIO BUFFERS_MB CACHE_MB
2086 47 0 97.8% 5 541
1952 0 0 100.0% 5 541
1851 0 0 100.0% 5 541
1904 0 0 100.0% 5 541
1903 0 0 100.0% 5 541
answered Dec 11 at 17:01
Ipor Sircer
10.5k11024
Needs a custom kernel withCONFIG_FUNCTION_PROFILERenabled :(
– bodqhrohro
Dec 12 at 1:13
add a comment |
Use cachestat-perf from perf-tools.
# cachestat-perf
Counting cache functions... Output every 1 seconds.
HITS MISSES DIRTIES RATIO BUFFERS_MB CACHE_MB
2086 47 0 97.8% 5 541
1952 0 0 100.0% 5 541
1851 0 0 100.0% 5 541
1904 0 0 100.0% 5 541
1903 0 0 100.0% 5 541
answered Dec 11 at 17:01
Ipor Sircer
10.5k11024
Needs a custom kernel withCONFIG_FUNCTION_PROFILERenabled :(
– bodqhrohro
Dec 12 at 1:13
add a comment |
Use cachestat-perf from perf-tools.
# cachestat-perf
Counting cache functions... Output every 1 seconds.
HITS MISSES DIRTIES RATIO BUFFERS_MB CACHE_MB
2086 47 0 97.8% 5 541
1952 0 0 100.0% 5 541
1851 0 0 100.0% 5 541
1904 0 0 100.0% 5 541
1903 0 0 100.0% 5 541
answered Dec 11 at 17:01
Ipor Sircer
10.5k11024
Use cachestat-perf from perf-tools.
# cachestat-perf
Counting cache functions... Output every 1 seconds.
HITS MISSES DIRTIES RATIO BUFFERS_MB CACHE_MB
2086 47 0 97.8% 5 541
1952 0 0 100.0% 5 541
1851 0 0 100.0% 5 541
1904 0 0 100.0% 5 541
1903 0 0 100.0% 5 541
answered Dec 11 at 17:01
Ipor Sircer
10.5k11024
answered Dec 11 at 17:01
Ipor Sircer
10.5k11024
answered Dec 11 at 17:01
Ipor Sircer
10.5k11024
answered Dec 11 at 17:01
Ipor Sircer
10.5k11024
10.5k11024
Needs a custom kernel withCONFIG_FUNCTION_PROFILERenabled :(
– bodqhrohro
Dec 12 at 1:13
add a comment |
Needs a custom kernel withCONFIG_FUNCTION_PROFILERenabled :(
– bodqhrohro
Dec 12 at 1:13
Needs a custom kernel with
CONFIG_FUNCTION_PROFILER enabled :(– bodqhrohro
Dec 12 at 1:13
Needs a custom kernel with
CONFIG_FUNCTION_PROFILER enabled :(– bodqhrohro
Dec 12 at 1:13
add a comment |
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