使用linux-fincore查看Linux系统缓存哪些文件

快来打我* 2022-05-25 00:52 380阅读 0赞

# 概述 #

*  linux-fincore 包含linux-fincore，linux-fincore，linux-fincore 三个工具。其中linux-fincore可以用来查看cache中有哪些文件。

# 编译安装 #

*  该工具最初发布于googlecode，但googlecode现在已经关闭了。可以从github上找到其代码。
 *  本人选用的是 [https://github.com/waleedmazhar/linux-ftools][https_github.com_waleedmazhar_linux-ftools] 这个链接的版本， 执行 ./configure; make; make install 可以直接编译安装。
 *  如果因选择版本以及编译环境差异，执行make时可能会报错： 例如`aclocal-1.10: command not found`和`automake-1.10: command not found`

cd . && /bin/sh /home/linux-ftools-master/missing --run aclocal-1.10 
    /home/linux-ftools-master/missing: line 54: aclocal-1.10: command not found
    WARNING: `aclocal-1.10' is missing on your system.  You should only need it if
             you modified `acinclude.m4' or `configure.ac'.  You might want
             to install the `Automake' and `Perl' packages.  Grab them from
             any GNU archive site.
     cd . && /bin/sh /home/linux-ftools-master/missing --run automake-1.10 --gnu 
    /home/linux-ftools-master/missing: line 54: automake-1.10: command not found
    WARNING: `automake-1.10' is missing on your system.  You should only need it if
             you modified `Makefile.am', `acinclude.m4' or `configure.ac'.
             You might want to install the `Automake' and `Perl' packages.
             Grab them from any GNU archive site.
    cd . && /bin/sh /home/linux-ftools-master/missing --run autoconf
    configure.ac:7: error: possibly undefined macro: AM_INIT_AUTOMAKE
          If this token and others are legitimate, please use m4_pattern_allow.
          See the Autoconf documentation.
    make: *** [configure] Error 1

*  对于类似错误，网上一般会说要安装automake对应版本之类的。但实际上，服务器上已经有更高版本的automake工具。这其实是因为Makefile.in中写死了使用低版本的automake工具导致的，可以通过以下步骤解决：
    
    1.  执行aclocal，产生aclocal.m4文件
    2.  执行autoconf，生成configure文件
    3.  执行automake命令，产生Makefile.in： `automake --add-missing`
    4.  执行configure命令，生成Makefile文件
    5.  重新执行`make` 和 `make install`,一切顺利.
    
    # 使用说明 #
    
     *  help信息如下：

[root]# /usr/local/bin/linux-fincore 
    fincore version 1.3.0
    fincore [options] files...
    
      -s --summarize          When comparing multiple files, print a summary report
      -p --pages              Print pages that are cached
      -o --only-cached        Only print stats for files that are actually in cache.
      -g --graph              Print a visual graph of each file's cached page distribution.
      -S --min-size           Require that each files size be larger than N bytes.
      -C --min-cached-size    Require that each files cached size be larger than N bytes.
      -P --min-perc-cached    Require percentage of a file that must be cached.
      -h --help               Print this message.
      -L --vertical           Print the output of this script vertically.

*  通常用法：执行 `linux-fincore --pages=false --summarize --only-cached *` 即可，其中\*代表查看任意文件的cache。也可以指定某个目录/\*，表示该目录中的所有文件。或指定某个具体的文件。
 *  实例：

[root]#./linux-fincore  --pages=false --summarize --only-cached  *
    filename                                                                                       size        total_pages    min_cached page       cached_pages        cached_size        cached_perc
    --------                                                                                       ----        -----------    ---------------       ------------        -----------        -----------
    aclocal.m4                                                                                   34,611                  9                  0                  9             36,864             100.00
    Could not mmap file: autom4te.cache: No such device
    config.log                                                                                   19,768                  5                  0                  5             20,480             100.00
    config.status                                                                                29,788                  8                  0                  8             32,768             100.00
    configure                                                                                   171,672                 42                  0                 42            172,032             100.00
    configure.ac                                                                                    864                  1                  0                  1              4,096             100.00
    Could not mmap file: debian: No such device
    depcomp                                                                                      17,574                  5                  0                  5             20,480             100.00
    INSTALL                                                                                       9,416                  3                  0                  3             12,288             100.00
    install-sh                                                                                   13,184                  4                  0                  4             16,384             100.00
    linux-fadvise                                                                                22,466                  6                  0                  6             24,576             100.00
    linux-fadvise.c                                                                               4,875                  2                  0                  2              8,192             100.00
    linux-fadvise.o                                                                              26,544                  7                  0                  7             28,672             100.00
    linux-fallocate                                                                              19,150                  5                  0                  5             20,480             100.00
    linux-fallocate.c                                                                             3,252                  1                  0                  1              4,096             100.00
    linux-fallocate.o                                                                            17,952                  5                  0                  5             20,480             100.00
    linux-fincore                                                                                42,137                 11                  0                 11             45,056             100.00
    linux-fincore.c                                                                              14,967                  4                  0                  4             16,384             100.00
    linux-fincore.o                                                                              67,592                 17                  0                 17             69,632             100.00
    linux-ftools.h                                                                                   83                  1                  0                  1              4,096             100.00
    Makefile                                                                                     20,772                  6                  0                  6             24,576             100.00
    Makefile.am                                                                                     209                  1                  0                  1              4,096             100.00
    Makefile.in                                                                                  20,055                  5                  0                  5             20,480             100.00
    missing                                                                                      11,135                  3                  0                  3             12,288             100.00
    NEWS                                                                                             65                  1                  0                  1              4,096             100.00
    README                                                                                        6,001                  2                  0                  2              8,192             100.00
    RELEASE                                                                                         372                  1                  0                  1              4,096             100.00
    showrlimit.c                                                                                  1,961                  1                  0                  1              4,096             100.00
    waste_memory.c                                                                                  699                  1                  0                  1              4,096             100.00
    ---
    total cached size: 643,072

## 遇到问题 ##

*  实测发现，直接执行 `linux-fincore --pages=false --summarize --only-cached *` 有时并不能完全显示所有的缓存。比如：  
    
    
     *  在测试中构造一个32GB大小的文本文件file1.csv，然后wc -l file1.csv，
     *  执行完毕后通过free可以看到系统cache已经有30多GB了，但执行上述linux-fincore命令却找不到file1.csv的cache记录（没有仔细分析其源码，不太清楚是什么原因）
 *  但是直接指定file1.csv文件名或其目录的话，是可以看到具体的缓存信息的：

[root]# ./linux-fincore  --pages=false --summarize --only-cached /home/cache_test/file1.csv 
    filename                                                                                       size        total_pages    min_cached page       cached_pages        cached_size        cached_perc
    --------                                                                                       ----        -----------    ---------------       ------------        -----------        -----------
    /home/cache_test/file1.csv                                                       33,792,286,436          8,250,070                  0          6,802,594     27,863,425,024              82.45
    ---
    total cached size: 27,863,425,024

# 参考资料： #

*  [http://blog.51cto.com/shanker/1787378][http_blog.51cto.com_shanker_1787378]
 *  [https://www.linuxidc.com/Linux/2015-09/122930.htm][https_www.linuxidc.com_Linux_2015-09_122930.htm]
 *  [https://blog.csdn.net/rapheler/article/details/52528577][https_blog.csdn.net_rapheler_article_details_52528577]
 *  [http://blog.yufeng.info/archives/688][http_blog.yufeng.info_archives_688]
 *  [http://www.ywnds.com/?p=9914][http_www.ywnds.com_p_9914]
 *  [https://github.com/tobert/pcstat][https_github.com_tobert_pcstat]
 *  [https://code.google.com/archive/p/linux-ftools/][https_code.google.com_archive_p_linux-ftools]

[https_github.com_waleedmazhar_linux-ftools]: https://github.com/waleedmazhar/linux-ftools
[http_blog.51cto.com_shanker_1787378]: http://blog.51cto.com/shanker/1787378
[https_www.linuxidc.com_Linux_2015-09_122930.htm]: https://www.linuxidc.com/Linux/2015-09/122930.htm
[https_blog.csdn.net_rapheler_article_details_52528577]: https://blog.csdn.net/rapheler/article/details/52528577
[http_blog.yufeng.info_archives_688]: http://blog.yufeng.info/archives/688
[http_www.ywnds.com_p_9914]: http://www.ywnds.com/?p=9914
[https_github.com_tobert_pcstat]: https://github.com/tobert/pcstat
[https_code.google.com_archive_p_linux-ftools]: https://code.google.com/archive/p/linux-ftools/