[dpdk-dev] [PATCH v2] app/test: fix autotest_runner crash

[Herakliusz Lipiec <herakliusz.lipiec@intel.com>]

On some systems when dpdk test is executed with make test command
autotest_runner crashes in first_cpu_on_node. This happens when list
of available cpus contains something that is not a cpu as first element.
Fixed by removing all non-cpu values from list of available cpus.

Bugzilla ID: 253
Fixes: 22dcd9a4d90f ("test: parallelize unit tests")
Cc: anatoly.burakov@intel.com
Cc: stable@dpdk.org
Signed-off-by: Herakliusz Lipiec <herakliusz.lipiec@intel.com>
---
 app/test/autotest_runner.py | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/app/test/autotest_runner.py b/app/test/autotest_runner.py
index b72716e1e..95e74c760 100644
--- a/app/test/autotest_runner.py
+++ b/app/test/autotest_runner.py
@@ -43,9 +43,16 @@ def get_numa_nodes():
 # find first (or any, really) CPU on a particular node, will be used to spread
 # processes around NUMA nodes to avoid exhausting memory on particular node
 def first_cpu_on_node(node_nr):
-    cpu_path = glob.glob("/sys/devices/system/node/node%d/cpu*" % node_nr)[0]
-    cpu_name = os.path.basename(cpu_path)
-    m = re.match(r"cpu(\d+)", cpu_name)
+    cpu_path = glob.glob("/sys/devices/system/node/node%d/cpu*" % node_nr)
+    r = re.compile(r"cpu(\d+)")
+    cpu_name = filter(None,
+            map(r.match,
+                map(os.path.basename, cpu_path)
+            )
+    )
+    # for compatibility between python 3 and 2 we need to make interable out
+    # of filter return as it returns list in python 2 and a generator in 3
+    m = next(iter(cpu_name))
     return int(m.group(1))
 
 
-- 
2.17.2