[gentoo-user] Out of memory during GCC compile

[gentoo-user] Out of memory during GCC compile

[Grant]

I'm trying to compile GCC on a remote system with 192MB RAM.  It's
completed successfully before but now it uses up all RAM.  The compile
doesn't stop but it must be thrashing.  I have MAKEOPTS="-j1" in
/etc/make.conf.  Am I jeopardizing my HD by letting it swap on the
compile right now?  I've ordered an upgrade to the max of 512MB.  I've
stopped all processes using up memory that I don't need including X.
Is there anything else I can do to get through the compile with 192MB
RAM?

- Grant

[gentoo-user] Re: Out of memory during GCC compile

[Nikos Chantziaras]

On 06/02/12 23:33, Grant wrote:
> I'm trying to compile GCC on a remote system with 192MB RAM.  It's
> completed successfully before but now it uses up all RAM.  The compile
> doesn't stop but it must be thrashing.  I have MAKEOPTS="-j1" in
> /etc/make.conf.  Am I jeopardizing my HD by letting it swap on the
> compile right now?  I've ordered an upgrade to the max of 512MB.  I've
> stopped all processes using up memory that I don't need including X.
> Is there anything else I can do to get through the compile with 192MB
> RAM?

Lowering optimization helps a lot (CFLAGS in make.conf).  For example 
-O1 or -Os instead of the standard -O2.

Re: [gentoo-user] Out of memory during GCC compile

[Paul Hartman]

On Mon, Feb 6, 2012 at 3:33 PM, Grant <emailgrant@gmail.com> wrote:
> I'm trying to compile GCC on a remote system with 192MB RAM.  It's
> completed successfully before but now it uses up all RAM.  The compile
> doesn't stop but it must be thrashing.  I have MAKEOPTS="-j1" in
> /etc/make.conf.  Am I jeopardizing my HD by letting it swap on the
> compile right now?  I've ordered an upgrade to the max of 512MB.  I've
> stopped all processes using up memory that I don't need including X.
> Is there anything else I can do to get through the compile with 192MB
> RAM?

Use -O0. Don't enable debugging. I think GCC has some switches to
control memory usage/heap limits. You might want to try those and set
them to something low like 16MB, it probably uses as much as it can by
default.

Re: [gentoo-user] Out of memory during GCC compile

[Robert David]

V Mon, 6 Feb 2012 13:33:21 -0800
Grant <emailgrant@gmail.com> napsáno:

> I'm trying to compile GCC on a remote system with 192MB RAM.  It's
> completed successfully before but now it uses up all RAM.  The compile
> doesn't stop but it must be thrashing.  I have MAKEOPTS="-j1" in
> /etc/make.conf.  Am I jeopardizing my HD by letting it swap on the
> compile right now?  I've ordered an upgrade to the max of 512MB.  I've
> stopped all processes using up memory that I don't need including X.
> Is there anything else I can do to get through the compile with 192MB
> RAM?
> 
> - Grant
> 

If you use -pipe as CFLAG remove it.
If not just try lower flags as mentioned (-O0).

Re: [gentoo-user] Out of memory during GCC compile

[Florian Philipp]

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Am 06.02.2012 22:33, schrieb Grant:
> I'm trying to compile GCC on a remote system with 192MB RAM.  It's
> completed successfully before but now it uses up all RAM.  The compile
> doesn't stop but it must be thrashing.  I have MAKEOPTS="-j1" in
> /etc/make.conf.  Am I jeopardizing my HD by letting it swap on the
> compile right now?  I've ordered an upgrade to the max of 512MB.  I've
> stopped all processes using up memory that I don't need including X.
> Is there anything else I can do to get through the compile with 192MB
> RAM?
> 
> - Grant
> 

I noticed a sudden spike in gcc's memory consumption here. I had enough
memory to keep up with it but it still filled ca. 6GB of RAM for a
single .c file. Then it went back down. If you experience the same, I
guess adding swap is reasonable as you won't need it for the whole time.

P.S: Did you consider using a bin-pkg from a different system? You could
also export your root-fs via NFS and compile in a chroot from a
different system.

Regards,
Florian Philipp


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