Nicolas Boichat has uploaded this change for review. (
https://gem5-review.googlesource.com/c/public/gem5/+/68177?usp=email )
Change subject: fastmodel: Check early for license server issue
......................................................................
fastmodel: Check early for license server issue
We have a setup that requires manual startup of an ssh proxy to
access license server, and without that, gem5 takes about a minute
until the license checkout times out (until then, it's unclear
why nothing is happening).
We filed a ticket with ARM to try to understand if we can reduce
the timeout or number of attempts on fastmodel side. But, for now,
we can just attempt to connect to license servers early on, and
fail quickly.
Change-Id: I37b84fd52cb7fb221a9e48dcb52a33a11f4d1580
---
M src/arch/arm/fastmodel/arm_fast_model.py
1 file changed, 73 insertions(+), 5 deletions(-)
diff --git a/src/arch/arm/fastmodel/arm_fast_model.py
b/src/arch/arm/fastmodel/arm_fast_model.py
index d2d911f..a1a0059 100644
--- a/src/arch/arm/fastmodel/arm_fast_model.py
+++ b/src/arch/arm/fastmodel/arm_fast_model.py
@@ -23,22 +23,68 @@
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+import logging
import os
+import socket
from m5.defines import buildEnv
import _m5.arm_fast_model
+LICENSE_ENV = 'ARMLMD_LICENSE_FILE'
def set_armlmd_license_file(force=False):
"""Set the ARMLMD_LICENSE_FILE environment variable. If "force" is
False, then it will only be set if it wasn't already set in the
environment. The value it's set to is the one gem5 was built with.
"""
- key = "ARMLMD_LICENSE_FILE"
- license_file = buildEnv[key]
- if force or key not in os.environ:
- os.environ[key] = license_file
+ license_file = buildEnv[LICENSE_ENV]
+ if force or LICENSE_ENV not in os.environ:
+ os.environ[LICENSE_ENV] = license_file
+def check_armlmd_license(timeout):
+ """Check if any of the provided license server can be reached, or
+ if a license file is provided. This allows to fail early and fast,
+ as fastmodel code makes multiple lengthy attempts to connect to
+ license server. "timeout" is in seconds.
+ """
+ reachable = False
+ servers = os.environ[LICENSE_ENV].split(':')
+
+ # Fastmodel appears to try these 2 extra server/file, regardless of
+ # env variable.
+ extras = ('27010@localhost', '/opt/arm/licenses/license.dat')
+ for extra in extras:
+ if extra not in servers:
+ servers.append(extra)
+
+ for server in servers:
+ tuple = server.split('@')
+ if len(tuple) != 2:
+ # Probably a file, not a server.
+ if os.path.exists(server):
+ reachable = True
+ logging.debug("License file %s exists." % server)
+ break
+ else:
+ logging.debug('License file "%s" does not exist.' % server)
+ continue
+ try:
+ # Try to connect to license server. This doesn't attempt to
+ # communicate with it, just checking reachability.
+ s = socket.create_connection(
+ (tuple[1], int(tuple[0])), timeout=timeout)
+ s.close()
+ reachable = True
+ logging.debug("License server %s is reachable." % server)
+ break
+ except Exception as e:
+ logging.debug("Cannot connect to license server %s (%s: %s)." %
+ (server, type(e).__name__, e))
+
+ if not reachable:
+ raise ConnectionError(
+ "Cannot connect to any of the license servers (%s)." %
+ ', '.join(servers))
# These methods wrap much of the SystemC Export API described in section
# 7.6 of the Fast Models User Guide.
@@ -142,9 +188,12 @@
# This should be called once per simulation
def setup_simulation(
- sim_name, min_sync_latency=100.0 / 100000000, exit_on_dmi_warning=False
+ sim_name, min_sync_latency=100.0 / 100000000,
exit_on_dmi_warning=False,
+ check_license=True, check_license_timeout=1
):
set_armlmd_license_file()
+ if check_license:
+ check_armlmd_license(check_license_timeout)
scx_initialize(sim_name)
scx_set_min_sync_latency(min_sync_latency)
if exit_on_dmi_warning:
--
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Gerrit-Project: public/gem5
Gerrit-Branch: develop
Gerrit-Change-Id: I37b84fd52cb7fb221a9e48dcb52a33a11f4d1580
Gerrit-Change-Number: 68177
Gerrit-PatchSet: 1
Gerrit-Owner: Nicolas Boichat <drink...@google.com>
Gerrit-MessageType: newchange
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