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The commit 28f951ed introduced the `-fmax-pmcheck-iterations` flag and set the default limit to 1e7 iterations. However, this value is still high enough that it can result GHC to exhibit memory spikes beyond 1 GiB of RAM usage (heap profile showed several `(:)`s, as well as `THUNK_2_0`, and `PmCon` during the memory spikes) A value of 2e6 seems to be a safer upper bound which still manages to let the checker not run into the limit in most cases. Test Plan: Validate, try building a few Hackage packages Reviewers: austin, gkaracha, bgamari Reviewed By: bgamari Subscribers: thomie Differential Revision: https://phabricator.haskell.org/D2095
d2e05c6b