Difference between revisions of "Sar -r (memory)"
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↑ https://unix.stackexchange.com/questions/87908/how-do-you-empty-the-buffers-and-cache-on-a-linux-system
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| − | + | {{lowercase}} | |
<code>[[sar]] -r --human</code> | <code>[[sar]] -r --human</code> | ||
| − | 09:38:01 PM kbmemfree kbavail kbmemused %memused | + | 09:38:01 PM kbmemfree kbavail kbmemused %memused kb[[buffers]] kb[[cached]] [[kbcommit]] [[%commit]] kbactive kbinact [[kbdirty]] |
09:39:01 PM 122.1G 478.5G 381.5G 75.8% 385.4M 348.8G 25.4G 5.0% 39.7G 330.0G 96.2M | 09:39:01 PM 122.1G 478.5G 381.5G 75.8% 385.4M 348.8G 25.4G 5.0% 39.7G 330.0G 96.2M | ||
09:40:01 PM 118.7G 478.5G 384.9G 76.4% 385.5M 352.1G 25.4G 5.0% 39.8G 333.2G 406.1M | 09:40:01 PM 118.7G 478.5G 384.9G 76.4% 385.5M 352.1G 25.4G 5.0% 39.8G 333.2G 406.1M | ||
| Line 13: | Line 13: | ||
00:15:01 130.0M 304.9M 855.2M 86.8% 49.1M 292.4M 1.5G 157.1% 568.9M 175.3M 288.0k | 00:15:01 130.0M 304.9M 855.2M 86.8% 49.1M 292.4M 1.5G 157.1% 568.9M 175.3M 288.0k | ||
00:20:01 129.7M 305.0M 855.5M 86.8% 49.3M 292.6M 1.5G 157.5% 569.0M 175.5M 328.0k | 00:20:01 129.7M 305.0M 855.5M 86.8% 49.3M 292.6M 1.5G 157.5% 569.0M 175.5M 328.0k | ||
| + | |||
| + | 00:00:01 kbmemfree kbavail kbmemused %memused kbbuffers kbcached kbcommit %commit kbactive kbinact kbdirty | ||
| + | 05:00:01 68.5M 177.6M 916.6M 93.0% 21.0M 269.9M 1.0G 104.8% 687.1M 118.9M 704.0k | ||
| + | 05:05:01 73.2M 32.9M 911.9M 92.6% 4.9M 100.8M 1.2G 128.1% 783.9M 14.1M 188.0k | ||
| + | 05:10:05 50.8M 0.0k 934.3M 94.8% 1.2M 79.9M 1.3G 137.5% 813.9M 3.7M 0.0k | ||
| + | 05:15:13 48.8M 0.0k 936.3M 95.0% 248.0k 78.4M 1.3G 137.9% 815.8M 4.1M 32.0k | ||
| + | 05:20:53 458.5M 418.8M 526.6M 53.5% 7.8M 101.8M 759.3M 77.1% 394.0M 16.7M 1.5M | ||
| + | 05:25:01 110.5M 416.1M 874.7M 88.8% 27.7M 457.0M 1.0G 106.5% 462.6M 293.7M 1.3M | ||
== Activities == | == Activities == | ||
# Review total system memory: <code>[[free -h]]</code> | # Review total system memory: <code>[[free -h]]</code> | ||
| − | # Emptying the buffers cache: <code>[[free]] -h && [[sync]] && echo 3 > | + | # Emptying the buffers cache: <code>[[free]] -h && [[sync]] && echo 3 > [[/proc/sys/vm/drop_caches]] && free -h</code><ref>https://unix.stackexchange.com/questions/87908/how-do-you-empty-the-buffers-and-cache-on-a-linux-system</ref> |
| − | # Use <code>fio</code> with <code>direct=0</code> to fill up your cache. | + | # Use <code>[[fio]]</code> command with <code>[[direct=0]]</code> option to fill up your cache. |
| − | + | # [[Read all sar collected files]] | |
== Related commands == | == Related commands == | ||
| − | * [[ | + | * [[Memory]]: <code>[[sar -r]]</code> |
| + | * [[Swap]]: <code>[[sar -S]]</code> | ||
| + | * <code>[[sar -W (Swapping)]]</code> | ||
* <code>[[systemd-cgtop]]</code> | * <code>[[systemd-cgtop]]</code> | ||
| + | * <code>[[free -h]]</code> | ||
| + | * <code>[[mem_used_percent]]</code> [[AWS Cloudwatch agent]] | ||
| + | * <code>[[journalctl -r]] | grep [[oom]]</code> | ||
| + | * [[Cannot allocate memory]] | ||
== See also == | == See also == | ||
Latest revision as of 05:57, 9 June 2024
sar -r --human
09:38:01 PM kbmemfree kbavail kbmemused %memused kbbuffers kbcached kbcommit %commit kbactive kbinact kbdirty 09:39:01 PM 122.1G 478.5G 381.5G 75.8% 385.4M 348.8G 25.4G 5.0% 39.7G 330.0G 96.2M 09:40:01 PM 118.7G 478.5G 384.9G 76.4% 385.5M 352.1G 25.4G 5.0% 39.8G 333.2G 406.1M 09:41:01 PM 116.1G 478.4G 387.4G 76.9% 385.6M 354.6G 25.4G 5.0% 39.9G 335.7G 259.2M
00:00:01 kbmemfree kbavail kbmemused %memused kbbuffers kbcached kbcommit %commit kbactive kbinact kbdirty 00:05:01 131.5M 305.9M 853.7M 86.7% 48.8M 292.3M 1.5G 157.4% 567.6M 175.3M 632.0k 00:10:01 128.7M 303.4M 856.5M 86.9% 48.9M 292.4M 1.5G 157.1% 570.2M 175.4M 300.0k 00:15:01 130.0M 304.9M 855.2M 86.8% 49.1M 292.4M 1.5G 157.1% 568.9M 175.3M 288.0k 00:20:01 129.7M 305.0M 855.5M 86.8% 49.3M 292.6M 1.5G 157.5% 569.0M 175.5M 328.0k
00:00:01 kbmemfree kbavail kbmemused %memused kbbuffers kbcached kbcommit %commit kbactive kbinact kbdirty 05:00:01 68.5M 177.6M 916.6M 93.0% 21.0M 269.9M 1.0G 104.8% 687.1M 118.9M 704.0k 05:05:01 73.2M 32.9M 911.9M 92.6% 4.9M 100.8M 1.2G 128.1% 783.9M 14.1M 188.0k 05:10:05 50.8M 0.0k 934.3M 94.8% 1.2M 79.9M 1.3G 137.5% 813.9M 3.7M 0.0k 05:15:13 48.8M 0.0k 936.3M 95.0% 248.0k 78.4M 1.3G 137.9% 815.8M 4.1M 32.0k 05:20:53 458.5M 418.8M 526.6M 53.5% 7.8M 101.8M 759.3M 77.1% 394.0M 16.7M 1.5M 05:25:01 110.5M 416.1M 874.7M 88.8% 27.7M 457.0M 1.0G 106.5% 462.6M 293.7M 1.3M
Activities[edit]
- Review total system memory:
free -h - Emptying the buffers cache:
free -h && sync && echo 3 > /proc/sys/vm/drop_caches && free -h[1] - Use
fiocommand withdirect=0option to fill up your cache. - Read all sar collected files
Related commands[edit]
- Memory:
sar -r - Swap:
sar -S sar -W (Swapping)systemd-cgtopfree -hmem_used_percentAWS Cloudwatch agentjournalctl -r | grep oom- Cannot allocate memory
See also[edit]
- Swap,
swapon,swapoff,mkswap,swaplabel,free,sar -r,sar -S,sar -W,vmstat,vm.swappiness,/proc/swaps,/etc/fstab, Add a swap disk,systemd.swap sar, installation, sar -A,sar -F, sar -d,sar -I ALL,sar -n NFS,sar -r,sar -S,sar -W,sar -n ALL, Installing sysstat using Ansible,/etc/sysstat/sysstat,/etc/cron.d/sysstat,sar --help, Sysstat changelog,/var/log/sysstat/,cpu time steal, sargraph, isag, Telegraf- Performance: sysstat,
sar,sadc,debian-sa1,sa1, sa2,iostat,nfsiostatmpstat,changelog,/usr/lib/sysstat/sadc,/etc/sysstat/sysstat,pidstat, irqstat - Memory: RAM, DRAM, SDRAM, NVRAM, DMA, ECC, VRAM, Nanya, SGRAM, DDR
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