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Fix a scaling error in the new time command

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This commit is contained in:
Gregory Nutt 2015-12-31 10:03:04 -06:00
parent 3b3b8faf68
commit 6c89c01cf5
2 changed files with 16 additions and 5 deletions
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19
nshlib/README.txt
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@ -1012,10 +1012,14 @@ o time "<command>"
nsh> time "sleep 2" nsh> time "sleep 2"
2.0001 sec 2.0100 sec
nsh>
The addition 100 microseconds in this example is the additional overhead The additional 10 millseconds in this example is due primarily to the
of the time command execution itself which is included in the total. quantization error in the timing (this setup used a 10 millisecond
periodic system timer). Other sources of error could include the
additional overhead of the time command execution itself which is
included in the total.
Notice that: Notice that:
@ -1023,9 +1027,16 @@ o time "<command>"
sleep [3:100] sleep [3:100]
0.0000 sec 0.0000 sec
nsh>
Since the sleep command is executed in background, the sleep command Since the sleep command is executed in background, the sleep command
completes almost immediately. completes almost immediately. As opposed to the following where the
time command is run in background with the sleep command:
nsh> time "sleep 2" &
time [3:100]
nsh>
2.0100 sec
o unset <name> o unset <name>

2
nshlib/nsh_timcmds.c
View File

@ -336,7 +336,7 @@ int cmd_time(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv)
diff.tv_nsec = end.tv_nsec - start.tv_nsec; diff.tv_nsec = end.tv_nsec - start.tv_nsec;
nsh_output(vtbl, "\n%lu.%04lu sec\n", (unsigned long)diff.tv_sec, nsh_output(vtbl, "\n%lu.%04lu sec\n", (unsigned long)diff.tv_sec,
(unsigned long)diff.tv_nsec / 10000000); (unsigned long)diff.tv_nsec / 100000);
} }
} }