Disable idle GC in the default nix build

[weebl2000]

I guess this is what's causing cardano-node constantly high CPU usage when running in Daedalus.

My suggestion would be to also add "-c" - always compact oldest generation instead of copying collection. Since most heap data is very long-lived, this can cause considerably less memory usage.

[weebl2000]

@jbgi Not sure who to tag, but I've seen you've worked on this file. :)

[jbgi]

I think this rts option is already set at compile time:
https://github.com/input-output-hk/cardano-node/blob/2cbe363874d0261bc62f52185cf23ed492cf4859/cardano-node/cardano-node.cabal#L166

[weebl2000]

I think this rts option is already set at compile time:

https://github.com/input-output-hk/cardano-node/blob/2cbe363874d0261bc62f52185cf23ed492cf4859/cardano-node/cardano-node.cabal#L166

Hmm. I thought it was maybe overriding the default, but apparently not. I was trying to debug running the Daedalus / cardano-node combination but no luck so far with the nix build. But it seems cardano-node is always using 100% of one core when running from Daedalus. I'll try to investigate further.

[weebl2000]

I think this rts option is already set at compile time:

https://github.com/input-output-hk/cardano-node/blob/2cbe363874d0261bc62f52185cf23ed492cf4859/cardano-node/cardano-node.cabal#L166

One more question. I'm not very familiar with nixos or native binaries and their linking to libraries and stuff. But do you think that running a strip and patchelf --shrink-rpath might remove the default GHC RTS options assigned at compile time?

https://github.com/input-output-hk/daedalus/blob/develop/nix/cardano-bridge.nix#L24

Such as done here.

[weebl2000]

I'm getting closer, it's not here. :P

[weebl2000]

@jbgi It seems the NixOS parameters are used when running from NixOS. I think -I0 would be a good addition still.

[jbgi]

bors r+

[jbgi]

bors retry

[weebl2000]

@jbgi Do I have to make any changes to fix the build?

[jbgi]

bors r+

[iohk-bors]

Build succeeded:

• ci/hydra-build:required
• buildkite/cardano-node