gpu: run a single representative scene per tool by default

glmark2 (terrain) and vkmark (texture) now each run one ~10s scene instead of
the full multi-scene sweep, cutting the headed part to about a minute. Scene
seconds and the vkmark scene are tunable via GLMARK2_DURATION, VKMARK_DURATION
and VKMARK_BENCH.

README.md

@@ -240,12 +240,12 @@ Headless part (`~25-30 min` per pass):
 | 9 | `systemd-analyze` | <1 min | informational |
 | + | PTS short core (`RUN_PTS=1`) | +30-45 min | kernel build, c-ray, stream |
 
-Headed part (`~4-5 min` per pass):
+Headed part (`~1 min` per pass):
 
 | # | Step | ~Time | Notes |
 |---|------|-------|-------|
-| 1 | `glmark2` | ~1-2 min | pinned to the dGPU |
+| 1 | `glmark2` (terrain, 10 s) | ~15 s | pinned to the dGPU |
-| 2 | `vkmark` | ~2-3 min | pinned to the dGPU |
+| 2 | `vkmark` (texture, 10 s) | ~15 s | pinned to the dGPU |
 
 Every step writes its own `results/<name>-<tag>.txt/json`.
 
@@ -256,6 +256,7 @@ RUN_APPS=0 ./run-benchmarks.sh before headless   # skip the app workloads
 CORPUS=/path ./run-benchmarks.sh before headless # app corpus cache location
 GOVERNOR=powersave ./run-benchmarks.sh after headless   # pin a governor (see §7)
 RUN_GPU=0 ./run-benchmarks.sh before             # skip GPU tests in 'all' mode
+GLMARK2_DURATION=10 VKMARK_BENCH=shading ./run-benchmarks.sh before headed  # GPU scenes
 TOOLS=/path ./run-benchmarks.sh before headless  # custom tools dir
 GPU_PCI=0000:03:00.0 ./run-benchmarks.sh before headed  # force a GPU
 FIOFILE=/data/fio.bin ./run-benchmarks.sh before headless  # fio scratch file

benchmarks.txt

@@ -158,8 +158,10 @@
     # (from /sys/class/drm: the dGPU is the card with no connected connector)
     glxinfo -B        | tee glxinfo-$TAG.txt
     vulkaninfo --summary | tee vulkan-$TAG.txt
-    glmark2 -b :duration=30 2>&1 | tail -25 | tee glmark2-$TAG.txt
+    # One representative scene each (fast, comparable); tune with GLMARK2_DURATION,
-    vkmark --duration 60    2>&1 | tail -30 | tee vkmark-$TAG.txt
+    # VKMARK_DURATION and VKMARK_BENCH (texture|shading|vertex).
+    glmark2 -b terrain:duration=10 2>&1 | tail -25 | tee glmark2-$TAG.txt
+    vkmark  -b texture:duration=10 2>&1 | tail -30 | tee vkmark-$TAG.txt
     phoronix-test-suite benchmark pts/vkmark   # if available in cache
     # Confirm which GPU rendered: grep -i 'device\|renderer' glxinfo-$TAG.txt
 

run-benchmarks.sh

@@ -39,6 +39,9 @@
 #   CORPUS_URL=...         base URL the sample corpora are fetched from
 #   GOVERNOR=powersave     CPU governor to pin (default performance); an explicit
 #                          value is appended to the tag, e.g. after-powersave-headless
+#   GLMARK2_DURATION=10    seconds for the glmark2 scene (headed part)
+#   VKMARK_DURATION=10     seconds for the vkmark scene (headed part)
+#   VKMARK_BENCH=texture   vkmark scene to run (e.g. texture, shading, vertex)
 #
 # Run the headless part with a TTY so sudo can prompt for power logging:
 #   ssh -t <target> '~/basic-benchmark/run-benchmarks.sh before headless'
@@ -817,16 +820,19 @@ run_headless() {
 
 run_headed() {
   section "GPU: glmark2 / vkmark (pinned to ${GPU_PCI:-default})"
+  # One representative scene each by default (fast, comparable). Override the
+  # scene/options with GLMARK2_BENCH / VKMARK_BENCH, or the seconds with
+  # GLMARK2_DURATION / VKMARK_DURATION.
   phase "glmark2"
   if have glmark2; then
-    glmark2 -b :duration=30 2>&1 | tail -25 | tee "glmark2-$TAG.txt"
+    glmark2 -b "terrain:duration=${GLMARK2_DURATION:-10}" 2>&1 | tail -25 | tee "glmark2-$TAG.txt"
     reg_score "glmark2" "$(gpu_score glmark2 "glmark2-$TAG.txt")"
   else
     printf 'skip (glmark2 missing) — sudo dnf install -y glmark2\n'
   fi
   phase "vkmark"
   if have vkmark; then
-    vkmark -b :duration=60 2>&1 | tail -30 | tee "vkmark-$TAG.txt"
+    vkmark -b "${VKMARK_BENCH:-texture}:duration=${VKMARK_DURATION:-10}" 2>&1 | tail -30 | tee "vkmark-$TAG.txt"
     reg_score "vkmark" "$(gpu_score vkmark "vkmark-$TAG.txt")"
   else
     printf 'skip (vkmark missing) — sudo dnf install -y vkmark\n'