commit 1569c56d2b93873d833c0c6ef1d0cc475042367b
from: Stefan Sperling <stsp@stsp.name>
via: Thomas Adam <thomas@xteddy.org>
date: Tue May 31 23:14:47 2022 UTC

reduce the amount of memory used for caching deltas during deltification

With files sorted properly for deltification we produce better deltas
but end up consuming more memory and risk running into OpenBSD ulimits
during packing. To compensate, reduce the threshold for the amount of
delta data we store in memory, spooling more deltas into the cache file.

ok op@

commit - d23a6c95c554b90f2f8d0ecaeb09b73e4433576c
commit + 1569c56d2b93873d833c0c6ef1d0cc475042367b
blob - 70683bf242e8e041d19e21fdd6a8dd1eddc6421f
blob + 85193d78da56d79a1b3218972933af866b15f376
--- lib/pack_create.c
+++ lib/pack_create.c
@@ -680,7 +680,7 @@ pick_deltas(struct got_pack_meta **meta, int nmeta, in
 	off_t size, best_size;
 	const int max_base_candidates = 3;
 	size_t delta_memsize = 0;
-	const size_t max_delta_memsize = 25 * GOT_DELTA_RESULT_SIZE_CACHED_MAX;
+	const size_t max_delta_memsize = 4 * GOT_DELTA_RESULT_SIZE_CACHED_MAX;
 	int outfd = -1;
 
 	qsort(meta, nmeta, sizeof(struct got_pack_meta *), delta_order_cmp);