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  Impact test noatime Linux file access time
  Add Date : 2018-11-21      
  File (such as abc) has three times:

# Stat abc

Access: 2015-04-16 19: 30: 13.665970572 +0800
Modify: 2015-04-16 19: 28: 53.770002677 +0800
Change: 2015-04-16 19: 28: 53.784001602 +0800

Access is the file last access time, cat command will change this time. However, due to the cache, in the short term only the first cat 'abc' when

We will change this time. If you have access to the file each time change this time, there will be a relatively large impact on the performance requirements of the system. So we can set up

When the configuration file is accessed, Access does not change this time.

Suppose mount directory / tmp change this setting:

1) Change each visit Access time: atime
$ Mount / tmp -o remount, atime

2) do not change each time you visit Access time: noatime, nodiratime
$ Mount / tmp -o remount, noatime

In the case of 1 and 2 can be tested separately:

# Cp abc abc2 ### to prevent the cat cached, so a new file cp
# Stat abc2
# Cat abc2
# Stat abc2
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