[igt-dev] [igt PATCH v1 1/1] i915/gem_ctx_switch: evenly run 4 child processes

[Caz Yokoyama]

gem_ctx_switch at basic-all-light test creates 4 child processes for each
engine and wait. render engine runs slower than others. By this patch,
4 child processes run fairly evenly. As a result, parent process runs
faster. On my NUC, its execution time becomes about half.

Signed-off-by: Caz Yokoyama <caz.yokoyama at intel.com>
---
 tests/i915/gem_ctx_switch.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tests/i915/gem_ctx_switch.c b/tests/i915/gem_ctx_switch.c
index 1208cb8d..9ed22f35 100644
--- a/tests/i915/gem_ctx_switch.c
+++ b/tests/i915/gem_ctx_switch.c
@@ -247,7 +247,9 @@ static void all(int fd, uint32_t handle, unsigned flags, int timeout)
 
 				clock_gettime(CLOCK_MONOTONIC, &start);
 				do {
-					for (int loop = 0; loop < qlen; loop++) {
+					int x = strcmp(name[child], "render") == 0 ? qlen/2 : qlen;
+
+					for (int loop = 0; loop < x; loop++) {
 						execbuf.rsvd1 = contexts[loop % nctx];
 						gem_execbuf(fd, &execbuf);
 					}
-- 
2.17.1