Major Description
cbc-cat should have an option to be used without printing the output to the terminal.
if you use it to diagnose number of documents fetch timings with -T, or if you just want to check if everything works as sort of an initial sanity you don't always interested with the actual document value.
Attachments
Gerrit Reviews
| For Gerrit Dashboard: CCBC-1211 | ||||||
|---|---|---|---|---|---|---|
| # | Subject | Branch | Project | Status | CR | V |
| 125286,1 | CCBC-1211 cbc-cat should have an option to print documents to /dev/null | master | libcouchbase | Status: ABANDONED | 0 | +1 |
Activity
if a customer wants to use cat to see how fast couchbase is, they should use it with a single document argument. Multiple document arguments are processed in parallel. For example, if I retrieve 100 documents (in parallel) the timing histogram looks like this:
[220 - 229 ]us |## - 1
[240 - 249 ]us |#### - 2
[250 - 259 ]us |#### - 2
[260 - 269 ]us |################ - 7
[280 - 289 ]us |## - 1
[290 - 299 ]us |####### - 3
[300 - 309 ]us |####### - 3
[320 - 329 ]us |####### - 3
[330 - 339 ]us |#### - 2
[360 - 369 ]us |## - 1
[370 - 379 ]us |#### - 2
[380 - 389 ]us |#### - 2
[390 - 399 ]us |######### - 4
[410 - 419 ]us |#### - 2
[420 - 429 ]us |####### - 3
[430 - 439 ]us |#### - 2
[460 - 469 ]us |####### - 3
[470 - 479 ]us |#### - 2
[480 - 489 ]us |####### - 3
[490 - 499 ]us |## - 1
[500 - 509 ]us |## - 1
[510 - 519 ]us |####### - 3
[520 - 529 ]us |#### - 2
[530 - 539 ]us |####### - 3
[570 - 579 ]us |#### - 2
[580 - 589 ]us |######### - 4
[590 - 599 ]us |#### - 2
[600 - 609 ]us |####### - 3
[610 - 619 ]us |####### - 3
[620 - 629 ]us |## - 1
[630 - 639 ]us |######### - 4
[640 - 649 ]us |######### - 4
[650 - 659 ]us |####### - 3
[660 - 669 ]us |########### - 5
[670 - 679 ]us |################################ - 14
[680 - 689 ]us |################## - 8
[690 - 699 ]us |################## - 8
[700 - 709 ]us |####### - 3
[710 - 719 ]us |####### - 3
[720 - 729 ]us |########### - 5
[730 - 739 ]us |####### - 3
[740 - 749 ]us |#### - 2
[750 - 759 ]us |################## - 8
[760 - 769 ]us |####################### - 10
[770 - 779 ]us |#### - 2
[780 - 789 ]us |##################### - 9
[790 - 799 ]us |######### - 4
[800 - 809 ]us |##################### - 9
[810 - 819 ]us |######################################## - 17
[820 - 829 ]us |########### - 5
[830 - 839 ]us |## - 1real 0m0.064s
user 0m0.010s
sys 0m0.005s
but if I retrieve them serially, the timing histogam looks like this: (there is no cat option to do this, I had to modify the code)
[40 - 49 ]us |######################################## - 46
[50 - 59 ]us |########################### - 32
[60 - 69 ]us |####### - 9
[70 - 79 ]us |##### - 6
[80 - 89 ]us |## - 3
[90 - 99 ]us | - 1
[100 - 109 ]us | - 1
[110 - 119 ]us |# - 2
[160 - 169 ]us | - 1
real 0m0.314s
user 0m0.010s
sys 0m0.007s
Modification is http://review.couchbase.org/c/libcouchbase/+/125286
Simply not installing the callbacks might not be a good idea. I suspect they free memory used by the response - I didn't check.
Just printing the histogram to stderr would suffice.
Then the document could be redirected to /dev/null and the document metadata and histogram would go to stderr.