>On 25 November 2010 00:52, Henrik Goldman <h...@x-formation.com> wrote: >> Hello, >> >> I wonder if anyone ever considered using memcached as an optional backend >> for ccached? >> >> Here is the issue we're considering. In our C++ project we have a number of >> developers doing their own local compilations. When any updates occurs (e.g. >> they update to the latest source code from scm) the compilations are the >> same for all the machines. Sure ccache is great when you re-do the >> compilation, but here the compilation being re-done on a number of machines. >> Using memcached would allow us to have a truly distributed cache that would >> both help developers and machines in the build farm to speed up work. >> >> What do you guys think? > >I think it would be a pretty interesting idea. > >Obviously you would need to trust all the other clients writing into >the cache, but that's probably feasible in this environment. > >A shared cache kept entirely in ram might grow fairly big, but it's >not so expensive to get an 8GB or 16GB machine devoted to this.
Why don't you just put the cache on a NFS (/CIFS) mounted volume? With the most recent version this should work well. If you already are, are you really doing enough writes to swamp a NFS cache server? It probably requires hundreds of compiling clients; since we have over a hundred here and don't see a bottleneck - with a single well performing NFS server. If you need more performance you can get a better NFS server appliance (up to thousands of disks if you have the $$), or on the cheap by striding the cache across 16 (or 256) small NFS servers. You can also serve NFS from a ram disk via loopback, although if you give a machine enough memory, it's going to keep a normal file system in RAM anyways, so using a ramdisk primarily provides you with write bandwidth, not read bandwidth nor latency. Memcached would provide a nice benefit of providing tolerance for machines going down, and somewhat better latency, but perhaps the above ideas with the existing version can deliver enough performance for you. -Wilson _______________________________________________ ccache mailing list firstname.lastname@example.org https://lists.samba.org/mailman/listinfo/ccache