Difference between revisions of "Memory"
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[[File:Media-flash-memory-stick.svg]] | [[File:Media-flash-memory-stick.svg]] | ||
| − | Python, | + | Python, Linkers and Virtual Memory https://www.youtube.com/watch?v=twQKAoq2OPE |
Reporting on "actual" memory usage of your application with smem http://linuxaria.com/pills/linux-terminal-check-who-uses-all-your-memory-with-smem | Reporting on "actual" memory usage of your application with smem http://linuxaria.com/pills/linux-terminal-check-who-uses-all-your-memory-with-smem | ||
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| + | ==Transparent Hugepages == | ||
| + | * https://access.redhat.com/solutions/46111 for Fedora and RHEL Note: their commands at the end of the article for determining if HugePages are disabled do not work in my limited tests. I have both Ubuntu and CentOS systems which are using HugePages, yet <code>grep -i HugePages_Total /proc/meminfo</code> <code>cat /proc/sys/vm/nr_hugepages</code> and <code>sysctl vm.nr_hugepages</code> all report zero. Meanwhile <code>grep AnonHugePages /proc/meminfo</code> and <code>grep -e AnonHugePages /proc/*/smaps | awk '{ if($2>4) print $0} ' | awk -F "/" '{print $0; system("ps -fp " $3)} '</code> report actual usage. The biggest applications? [[mysql]]d, [[java]], [[python]], [[node]], polkitd, [[mongo]]d, [[httpd]] | ||
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| + | Strangely, the value for <code>cat /sys/kernel/mm/transparent_hugepage/enabled</code> | ||
| + | <pre>[always] madvise never</pre> | ||
[[Category:System Administration]] | [[Category:System Administration]] | ||
| + | [[Category:Memory]] | ||
| + | [[Category:Performance]] | ||
| + | [[Category:Kernel]] | ||
| + | [[Category:Configuration Management]] | ||
Revision as of 16:01, 26 July 2018
Python, Linkers and Virtual Memory https://www.youtube.com/watch?v=twQKAoq2OPE
Reporting on "actual" memory usage of your application with smem http://linuxaria.com/pills/linux-terminal-check-who-uses-all-your-memory-with-smem
Transparent Hugepages[edit | edit source]
- https://access.redhat.com/solutions/46111 for Fedora and RHEL Note: their commands at the end of the article for determining if HugePages are disabled do not work in my limited tests. I have both Ubuntu and CentOS systems which are using HugePages, yet
grep -i HugePages_Total /proc/meminfocat /proc/sys/vm/nr_hugepagesandsysctl vm.nr_hugepagesall report zero. Meanwhilegrep AnonHugePages /proc/meminfoandgrep -e AnonHugePages /proc/*/smaps | awk '{ if($2>4) print $0} ' | awk -F "/" '{print $0; system("ps -fp " $3)} 'report actual usage. The biggest applications? mysqld, java, python, node, polkitd, mongod, httpd
Strangely, the value for cat /sys/kernel/mm/transparent_hugepage/enabled
[always] madvise never
