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From: "massimiliano.cuoghi at systemceramics dot com"
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Subject: [Bug breakpoints/28288] GDBserver should hide unreported fork childs
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Date: Mon, 15 Nov 2021 07:30:47 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D28288

--- Comment #40 from Massimiliano <massimiliano.cuoghi at systemceramics do=
t com> ---
(In reply to Massimiliano from comment #39)
> (In reply to Simon Marchi from comment #38)
> > 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 clea=
n &&
> > make V=3D1".  If you see -O2 on the command line, that's good.
> >=20
> > The steps that seems to take time is this one.  With GDB 8 (1-2 seconds=
):
> >=20
> > 10:19:12.918
> > 6362python
> > theDumper.fetchVariables({"autoderef":0,"context":"","displaystringlimi=
t":
> > "100","dyntype":1,"expanded":["watch","local","inspect","return"],"fanc=
y":1,
> > "formats":{},"nativemixed":0,"partialvar":"","passexceptions":0,
> > "qobjectnames":1,"resultvarname":"","stringcutoff":"10000","timestamps"=
:1,
> > "token":6362,"typeformats":{},"watchers":[{"exp":"6472697665724964","in=
ame":
> > "watch.0"},{"exp":"64737044726976657248617368","iname":"watch.1"},{"exp=
":
> > "657468496e666f726d6174696f6e48617368","iname":"watch.2"},{"exp":
> > "68526573756c74","iname":"watch.3"},{"exp":
> > "697041647272657373416e644e65746d61736b","iname":"watch.4"},{"exp":
> > "6c69737442617254797065","iname":"watch.5"},{"exp":
> > "6d61704d6f64756c61724d616368696e65496e666f","iname":"watch.6"},{"exp":
> > "6d6f64656c496e666f","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":"watch.
> > 12"}]})
> > 10:19:14.229
> >=20
> > With GDB 11 (~12 seconds):
> >=20
> > 11:22:22.323 [1ms]
> > 6462python
> > theDumper.fetchVariables({"autoderef":0,"context":"","displaystringlimi=
t":
> > "100","dyntype":1,"expanded":["watch","local","inspect","return"],"fanc=
y":1,
> > "formats":{},"nativemixed":0,"partialvar":"","passexceptions":0,
> > "qobjectnames":1,"resultvarname":"","stringcutoff":"10000","timestamps"=
:1,
> > "token":6462,"typeformats":{},"watchers":[{"exp":"6472697665724964","in=
ame":
> > "watch.0"},{"exp":"64737044726976657248617368","iname":"watch.1"},{"exp=
":
> > "657468496e666f726d6174696f6e48617368","iname":"watch.2"},{"exp":
> > "68526573756c74","iname":"watch.3"},{"exp":
> > "697041647272657373416e644e65746d61736b","iname":"watch.4"},{"exp":
> > "6c69737442617254797065","iname":"watch.5"},{"exp":
> > "6d61704d6f64756c61724d616368696e65496e666f","iname":"watch.6"},{"exp":
> > "6d6f64656c496e666f","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":"watch.
> > 12"}]})
> > 11:22:34.311
> >=20
> > That seems to be a Python helper used by QtCreator to dump variables.  =
It
> > might be possible to reproduce the slowness out of QtCreator by running=
 to
> > the same point, and doing a similar call to theDumper.fetchVariables.
> >=20
> > Do you see the same slowness if you debug locally instead of remotely?
>=20
> I had already checked the -o2 option and also in my opinion it is already
> optimized, even doing "make clean && make V =3D 1" does not change anythi=
ng. i
> have the same problem using the gdb11 locally

I also tried a different linux distribution, the distribution included the
gdb10, I didn't have to recompile it, it has the same slowness defect

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