diff --git a/usecases/ipr/hibench/hibenchonphysix.py b/usecases/ipr/hibench/hibenchonphysix.py
index ebb885b..1601313 100755
--- a/usecases/ipr/hibench/hibenchonphysix.py
+++ b/usecases/ipr/hibench/hibenchonphysix.py
@@ -236,7 +236,7 @@ def launch_job_for_host_group(hibridon_version: GitCommitTag, host_group_id: Hos
     subprocess.run(qsub_command, cwd=this_bench_dir, check=True, shell=True)
 
 
-def launch_perf_jobs(hibridon_version: GitCommitTag, results_dir: Path):
+def launch_perf_jobs(hibridon_version: GitCommitTag, results_dir: Path, arch_regexp: str):
     """
     hibridon_version: the version of hibridon to test, in the form of a valid commit number eg 'a3bed1c3ccfbca572003020d3e3d3b1ff3934fad'
     results_dir: where the results of the benchmark are stored (eg $GLOBAL_WORK_DIR/graffy/benchmarks/hibench)
@@ -247,7 +247,7 @@ def launch_perf_jobs(hibridon_version: GitCommitTag, results_dir: Path):
         'ifort'
     ]
 
-    host_groups = [
+    all_host_groups = [
         'intel_xeon_x5550',
         'intel_xeon_x5650',
         'intel_xeon_e5-2660',
@@ -261,6 +261,9 @@ def launch_perf_jobs(hibridon_version: GitCommitTag, results_dir: Path):
         'intel_xeon_gold_6248r',
         'amd_epyc_7282',
     ]
+    print(f'available host groups: {all_host_groups}')
+    host_groups = [host_group for host_group in all_host_groups if re.match(arch_regexp, host_group) is not None]
+    print(f'requested host groups: {host_groups}')
 
     for compiler in compilers:
         for host_group in host_groups:
@@ -283,6 +286,7 @@ def main():
     arg_parser = ArgumentParser(description='launches hibridon benchmark jobs on IPR\'s physix cluster', epilog='example:\n    --commit-id a3bed1c3ccfbca572003020d3e3d3b1ff3934fad')
     arg_parser.add_argument('--commit-id', type=str, required=True, help='the commit id of the version of code to benchmark')
     arg_parser.add_argument('--results-dir', type=Path, required=True, help='the root directory of the tree where the results of the benchmarks are stored (eg $GLOBAL_WORK_DIR/graffy/benchmarks/hibench)')
+    arg_parser.add_argument('--arch-regexp', type=str, default='.*', help='the regular expression for the architectures the benchmark is allowed to run on (eg "intel_xeon_.*"). By defauls, all available architectures are allowed.')
 
     args = arg_parser.parse_args()
     hibridon_version = args.commit_id
@@ -292,10 +296,12 @@ def main():
     # code_version='dd0f413b85cf0f727a5a4e88b2b02d75a28b377f'  # latest from branch graffy-issue51 as of 10/06/2022 00:30
 
     results_dir = Path(args.results_dir)
+    arch_regexp = args.arch_regexp
+
     if not path_is_reachable_by_compute_nodes(results_dir):
         raise ValueError('the results path is expected to be on a disk that is accessible to all cluster nodes, and it doesn\'t seem to be the case for {results_dir}')
 
-    launch_perf_jobs(hibridon_version, results_dir)
+    launch_perf_jobs(hibridon_version, results_dir, arch_regexp)
 
 
 main()
diff --git a/usecases/ipr/hibench/readme.md b/usecases/ipr/hibench/readme.md
index 7722eb0..e079578 100644
--- a/usecases/ipr/hibench/readme.md
+++ b/usecases/ipr/hibench/readme.md
@@ -1,9 +1,21 @@
 This example illustrates how `starbench` is used at IPR (Institut de Physique de Rennes) to measure the performance of [hibridon](https://github.com/hibridon/hibridon) on IPR's cluster (`physix`)
 
+
+
+
 usage:
 
 ```sh
-graffy@physix-frontal:/opt/ipr/cluster/work.global/graffy/starbench$ ./hibenchonphysix.py --commit-id 53894da48505892bfa05693a52312bacb12c70c9 --results-dir $GLOBAL_WORK_DIR/graffy/hibridon/benchmarks/starbench/hibench/2024-10-07-16:00:00
+20241007-15:08:10 graffy@graffy-ws2:~/work/starbench/starbench.git$ rsync --exclude .git --exclude starbench.venv --exclude tmp --exclude usecases/ipr/hibench/results  -va ./ graffy@alambix.ipr.univ-rennes.fr:/opt/ipr/cluster/work.global/graffy/starbench.git/
+sending incremental file list
+
+sent 1,416 bytes  received 25 bytes  960.67 bytes/sec
+total size is 140,225  speedup is 97.31
+last command status : [0]
+```
+
+```sh
+graffy@physix-frontal:/opt/ipr/cluster/work.global/graffy/starbench.git/usecases/ipr/hibench$ ./hibenchonphysix.py --commit-id 53894da48505892bfa05693a52312bacb12c70c9 --results-dir $GLOBAL_WORK_DIR/graffy/hibridon/benchmarks/starbench/hibench/$(date --iso=seconds) --arch-regexp 'intel_xeon_x5650'
 ```
 
 `hibenchonphysix.py` script launches two `sge` jobs for each machine type in `physix` cluster: