使用Hcache查看是谁占用了系统Buffer&Cache?
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一、hcache
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Linux用户可能经常遇到的一个问题是内存大部分都被Buffer和Cache占用了,但是有时候我们想知道到底Cache了些什么内容却没有一个直观好用的工具。今天给你介绍一个可以查看Linux当前缓存了哪些文件的小工具hcache。
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Hcache作者:伊布
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前几天看到有个人用go写了个pcstat,可以查看某个文件是否被缓存(作者的目的是数据库调优),也可以根据进程pid来查看都缓存了哪些文件,但是不能查看整个操作系统都cache了哪些文件。因此,我基于pcstat写了个hcache,增加了查看当前操作系统cache的前top个文件的特性,你可以从这里下载下来试用,如果有什么建议的话也欢迎反馈给我:hubottle@gmail.com
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官网:https://github.com/silenceshell/hcache
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二、安装
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hcache是使用GO开发的,安装非常简单,开箱即用。
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$ wget http://7xir15.com1.z0.glb.clouddn.com/hcache
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$ chmod +x hcache
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$ mv hcache /usr/local/bin/
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$ wget http://7xir15.com1.z0.glb.clouddn.com/hcache
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$ chmod +x hcache
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$ mv hcache /usr/local/bin/
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三、使用
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$ free -m
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total used free shared buff/cache available
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Mem: 7823 1952 174 9 5696 5518
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Swap: 0 0 0
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$ free -m
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total used free shared buff/cache available
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Mem: 7823 1952 174 9 5696 5518
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Swap: 0 0 0
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查看使用Cache最多的3个进程。
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$ hcache --top 3
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+----------------------------+----------------+------------+-----------+---------+
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| Name | Size (bytes) | Pages | Cached | Percent |
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|----------------------------+----------------+------------+-----------+---------|
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| /usr/bin/dockerd | 33368760 | 8147 | 8147 | 100.000 |
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| /usr/bin/docker-containerd | 7115584 | 1738 | 1738 | 100.000 |
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| /etc/udev/hwdb.bin | 6711310 | 1639 | 1639 | 100.000 |
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+----------------------------+----------------+------------+-----------+---------+
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$ hcache --top 3
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+----------------------------+----------------+------------+-----------+---------+
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| Name | Size (bytes) | Pages | Cached | Percent |
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|----------------------------+----------------+------------+-----------+---------|
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| /usr/bin/dockerd | 33368760 | 8147 | 8147 | 100.000 |
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| /usr/bin/docker-containerd | 7115584 | 1738 | 1738 | 100.000 |
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| /etc/udev/hwdb.bin | 6711310 | 1639 | 1639 | 100.000 |
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+----------------------------+----------------+------------+-----------+---------+
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默认情况下会显示cache文件的全路径,会比较长。可以使用--bname选项来仅显示文件名。
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$ hcache --top 3 --bname
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+-------------------+----------------+------------+-----------+---------+
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| Name | Size (bytes) | Pages | Cached | Percent |
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|-------------------+----------------+------------+-----------+---------|
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| dockerd | 33368760 | 8147 | 8147 | 100.000 |
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| docker-containerd | 7115584 | 1738 | 1738 | 100.000 |
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| hwdb.bin | 6711310 | 1639 | 1639 | 100.000 |
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+-------------------+----------------+------------+-----------+---------+
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$ hcache --top 3 --bname
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+-------------------+----------------+------------+-----------+---------+
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| Name | Size (bytes) | Pages | Cached | Percent |
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|-------------------+----------------+------------+-----------+---------|
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| dockerd | 33368760 | 8147 | 8147 | 100.000 |
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| docker-containerd | 7115584 | 1738 | 1738 | 100.000 |
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| hwdb.bin | 6711310 | 1639 | 1639 | 100.000 |
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+-------------------+----------------+------------+-----------+---------+
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查看指定进程的Cache使用情况。
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$ hcache -pid 2903 -bname
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$ hcache -pid 2903 -bname
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另外还可使用指定格式输出,比如:JSON、纯文本。更多使用方法可参考hcache -h。
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$ hcache -h
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Usage of hcache:
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-bname
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convert paths to basename to narrow the output
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-histo
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print a simple histogram instead of raw data
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-json
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return data in JSON format
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-nohdr
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omit the header from terse & text output
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-pid int
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show all open maps for the given pid
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-plain
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return data with no box characters
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-pps
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include the per-page status in JSON output
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-terse
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show terse output
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-top int
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convert paths to basename to narrow the output
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-unicode
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return data with unicode box characters
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$ hcache -h
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Usage of hcache:
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-bname
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convert paths to basename to narrow the output
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-histo
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print a simple histogram instead of raw data
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-json
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return data in JSON format
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-nohdr
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omit the header from terse & text output
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-pid int
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show all open maps for the given pid
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-plain
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return data with no box characters
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-pps
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include the per-page status in JSON output
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-terse
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show terse output
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-top int
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convert paths to basename to narrow the output
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-unicode
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return data with unicode box characters
- 完结。。
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