runners(h100-dgxc-slurm): wire AIPERF mmap cache mount + env

Matches the same pattern as launch_b200-dgxc, launch_h200-dgxc-slurm,
launch_gb300-{nv,cw}, launch_mi355x-amds, launch_h200-{nb,cw}: define
AIPERF_MMAP_CACHE_HOST_PATH on the host, bind-mount it to
/aiperf_mmap_cache in the container, and expose
AIPERF_DATASET_MMAP_CACHE_DIR=/aiperf_mmap_cache via --export.

Host path: /mnt/nfs/sa-shared/gharunners/ai-perf-cache (sibling of
the existing hf-hub-cache mount on the same NFS volume).

Needed for the new qwen3.5-fp8-h100-sglang-agentic recipe to reuse
the pre-built mmap dataset cache across runs rather than re-mmaping
every job.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Signed-off-by: Cam Quilici <cjquilici@gmail.com>

Author: cquil11

runners/launch_h100-dgxc-slurm.sh

@@ -280,6 +280,7 @@ EOF
 else
 
     HF_HUB_CACHE_MOUNT="/mnt/nfs/sa-shared/gharunners/hf-hub-cache/"
+    AIPERF_MMAP_CACHE_HOST_PATH="/mnt/nfs/sa-shared/gharunners/ai-perf-cache"
     SQUASH_FILE="/mnt/nfs/lustre/containers/$(echo "$IMAGE" | sed 's/[\/:@#]/_/g').sqsh"
     LOCK_FILE="${SQUASH_FILE}.lock"
 
@@ -306,10 +307,10 @@ else
 
     srun --jobid=$JOB_ID \
         --container-image=$SQUASH_FILE \
-        --container-mounts=$GITHUB_WORKSPACE:/workspace/,$HF_HUB_CACHE_MOUNT:$HF_HUB_CACHE \
+        --container-mounts=$GITHUB_WORKSPACE:/workspace/,$HF_HUB_CACHE_MOUNT:$HF_HUB_CACHE,$AIPERF_MMAP_CACHE_HOST_PATH:/aiperf_mmap_cache \
         --no-container-mount-home \
         --container-workdir=/workspace/ \
-        --no-container-entrypoint --export=ALL,PORT=8888 \
+        --no-container-entrypoint --export=ALL,PORT=8888,AIPERF_DATASET_MMAP_CACHE_DIR=/aiperf_mmap_cache \
         bash benchmarks/single_node/${SCENARIO_SUBDIR}${EXP_NAME%%_*}_${PRECISION}_h100.sh
 
     scancel $JOB_ID