linux - Can I use curl real time minus sys and user to generally get total response time -


in linux shell script running time against curl request rest service.

assuming single thread, if take real time of result , subtract user , sys time remaining time considered aggregation of network latency , time service required complete request?

if not, there simple way network latency , time service required complete request linux shell?

reference:what 'real', 'user' , 'sys' mean in output of time(1)?

if using curl, simplest way details on request timings use -w/--write-out option.

you can format output include variables like:

time_appconnect time, in seconds, took start until ssl/ssh/etc connect/handshake remote host completed. (added in 7.19.0)

time_connect time, in seconds, took start until tcp connect remote host (or proxy) completed.

time_namelookup time, in seconds, took start until name resolving completed.

time_pretransfer time, in seconds, took start until file transfer begin. includes pre-transfer commands , negotiations specific particular protocol(s) involved.

time_redirect time, in seconds, took redirection steps include name lookup, connect, pretransfer , transfer before final transaction started. time_redirect shows complete execution time multiple redirections. (added in 7.12.3)

time_starttransfer time, in seconds, took start until first byte transferred. includes time_pretransfer , time server needed calculate result.

time_total total time, in seconds, full operation lasted. time displayed millisecond resolution.

for example:

$ curl httpbin.org/ip -s -o output -w 'dns: %{time_namelookup} sec\nconnect: %{time_connect} sec\nuntil first byte: %{time_starttransfer} sec\ntotal: %{time_total} sec\n' dns: 0.061 sec connect: 0.297 sec until first byte: 0.502 sec total: 0.502 sec

and answer direct question - no, subtracting process , process kernel time wall clock time not, in general, give network latency or response time. consider system many processes competing cpu: in case wall clock curl process can longer actual service response time.


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