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From: "simark at simark dot ca" <sourceware-bugzilla@sourceware.org>
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Subject: [Bug breakpoints/28288] GDBserver should hide unreported fork childs
 from thread lists
Date: Fri, 12 Nov 2021 13:07:30 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D28288

--- Comment #38 from Simon Marchi <simark at simark dot ca> ---
For whether your GDB 11 build is optimized... I see some -O2 in the config.=
log.
 But to be sure, go in the gdb/ directory and do "make clean && make V=3D1"=
.  If
you see -O2 on the command line, that's good.

The steps that seems to take time is this one.  With GDB 8 (1-2 seconds):

10:19:12.918
6362python
theDumper.fetchVariables({"autoderef":0,"context":"","displaystringlimit":"=
100","dyntype":1,"expanded":["watch","local","inspect","return"],"fancy":1,=
"formats":{},"nativemixed":0,"partialvar":"","passexceptions":0,"qobjectnam=
es":1,"resultvarname":"","stringcutoff":"10000","timestamps":1,"token":6362=
,"typeformats":{},"watchers":[{"exp":"6472697665724964","iname":"watch.0"},=
{"exp":"64737044726976657248617368","iname":"watch.1"},{"exp":"657468496e66=
6f726d6174696f6e48617368","iname":"watch.2"},{"exp":"68526573756c74","iname=
":"watch.3"},{"exp":"697041647272657373416e644e65746d61736b","iname":"watch=
.4"},{"exp":"6c69737442617254797065","iname":"watch.5"},{"exp":"6d61704d6f6=
4756c61724d616368696e65496e666f","iname":"watch.6"},{"exp":"6d6f64656c496e6=
66f","iname":"watch.7"},{"exp":"6d6f64656c6c6f5374616d70616e7465","iname":"=
watch.8"},{"exp":"706172616d65746572546f436f6e76657274","iname":"watch.9"},=
{"exp":"706172616d6574657273546f4265436f6e766572746564","iname":"watch.10"}=
,{"exp":"76616c7565","iname":"watch.11"},{"exp":"76617248617368","iname":"w=
atch.12"}]})
10:19:14.229

With GDB 11 (~12 seconds):

11:22:22.323 [1ms]
6462python
theDumper.fetchVariables({"autoderef":0,"context":"","displaystringlimit":"=
100","dyntype":1,"expanded":["watch","local","inspect","return"],"fancy":1,=
"formats":{},"nativemixed":0,"partialvar":"","passexceptions":0,"qobjectnam=
es":1,"resultvarname":"","stringcutoff":"10000","timestamps":1,"token":6462=
,"typeformats":{},"watchers":[{"exp":"6472697665724964","iname":"watch.0"},=
{"exp":"64737044726976657248617368","iname":"watch.1"},{"exp":"657468496e66=
6f726d6174696f6e48617368","iname":"watch.2"},{"exp":"68526573756c74","iname=
":"watch.3"},{"exp":"697041647272657373416e644e65746d61736b","iname":"watch=
.4"},{"exp":"6c69737442617254797065","iname":"watch.5"},{"exp":"6d61704d6f6=
4756c61724d616368696e65496e666f","iname":"watch.6"},{"exp":"6d6f64656c496e6=
66f","iname":"watch.7"},{"exp":"6d6f64656c6c6f5374616d70616e7465","iname":"=
watch.8"},{"exp":"706172616d65746572546f436f6e76657274","iname":"watch.9"},=
{"exp":"706172616d6574657273546f4265436f6e766572746564","iname":"watch.10"}=
,{"exp":"76616c7565","iname":"watch.11"},{"exp":"76617248617368","iname":"w=
atch.12"}]})
11:22:34.311

That seems to be a Python helper used by QtCreator to dump variables.  It m=
ight
be possible to reproduce the slowness out of QtCreator by running to the sa=
me
point, and doing a similar call to theDumper.fetchVariables.

Do you see the same slowness if you debug locally instead of remotely?

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