Poudriere very slow when building in i386 jails

[Lorenzo Salvadore]

Hello.

Am I the only poudriere user that notices very long build times on an amd64 machine in i386 jails? This does not happen always, but frequently enough to be a nuisance.

More precisely, building some packages in an i386 jail takes ages compared to the same packages built in an amd64 jail. Moreover, sometimes building a package in an i386 jail with all options on takes a reasonable time while building the same package in the same jail but with all options off takes ages although the amount of work (compilation, testing...) to do is the same or even less than in the first case; and I experienced it with ccache installed and by doing the two builds in the written order.

I am trying to find a good example of port to offer for testing. At the moment the best example I can offer is security/libgcrypt (options off): I had to build it as a dependency for a testport yesterday, but after 6 hours of build I had to turn off the machine and gave up. But as I do not know well this port, I do not know if this time should be expected.
My machine is amd64, 3.6 Gb of RAM, dual core: not very powerful, I know, but I do not think this is enough to explain very large differences in build times in the contexts I described.

Any idea what is going on and what could I do to speed up things?

Thanks.
Lorenzo Salvadore.

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