egs: reduce the max number of BiCGSTAB iterations to 4

Since we typically do many multigrid iterations per step, being more
aggressive about a full inverse gives better performance.

1 files changed, 1 insertions, 1 deletions

diff --git a/ell_grid_solve.c b/ell_grid_solve.c
index c3ce3a7..fd6e455 100644
--- a/ell_grid_solve.c
+++ b/ell_grid_solve.c
@@ -481,7 +481,7 @@ static int exact_arrays_alloc(EGSContext *ctx)
         goto fail;
     }
 
-    ret = mg2di_bicgstab_context_alloc(&e->bicgstab, e->N, 64);
+    ret = mg2di_bicgstab_context_alloc(&e->bicgstab, e->N, 4);
     if (ret < 0)
         goto fail;