/proc/sys/fs/file-max
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2022-05-03 22:14:20
Linux的/proc/sys/fs/file max决定了当前内核可以打开的最大的文件句柄数。 查看当前的值: 这个值在kernel的文档里是这样描述的: 意思是file max一般为内存大小(KB)的10%来计算,如果使用shell,可以这样计算: 一般我们不需要主动设置这个值,除非这个值确实较 ......
linux的/proc/sys/fs/file-max决定了当前内核可以打开的最大的文件句柄数。
查看当前的值:
cat /proc/sys/fs/file-max
这个值在kernel的文档里是这样描述的:
the value in file-max denotes the maximum number of file handles that the linux kernel will allocate. when you get a lot of error messages about running out of file handles, you might want to raise this limit. the default value is 10% of ram in kilobytes. to change it, just write the new number into the file:
意思是file-max一般为内存大小(kb)的10%来计算,如果使用shell,可以这样计算:
grep -r memtotal /proc/meminfo | awk '{printf("%d",$2/10)}'
一般我们不需要主动设置这个值,除非这个值确实较小(可能有各种其他原因导致file-max没有设置为内存的10%)
如何查看当前kernel的句柄:
cat /proc/sys/fs/file-nr
file-nr在内核文档里得解释如下:
historically, the three values in file-nr denoted the number of allocated file handles, the number of allocated but unused file handles, and the maximum number of file handles. linux 2.6 always reports 0 as the number of free file handles -- this is not an error, it just means that the number of allocated file handles exactly matches the number of used file handles.
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