Re: [Users] Python SDK list vms slow, excessive cpu usage

Fetching the list of vms through the API with the python SDK takes several seconds[1] with 100% cpu usage in the python script. When I look at the engine log there is only one (fast) fetch from the API. The rest of the time is spent in the SDK processing a relatively small bit of XML data (only 26 VMs in my environment). This seems an excessive amount of CPU for processing ~6KB of XML. I've included some sample code [2] and output [3]. Attached is the cProfile output for this call and a visualization. [1] ~6,5 seconds on an oVirt VM with 1 vcpu on older hardware, ~3,5 seconds on a fast physical machine with an i5 cpu. [2] Sample code, add your own url/credentials/certificate: #!/usr/bin/python """Get ovirt VM names""" import time from ovirtsdk.api import API from ovirtsdk.xml import params def print_elapsed(logString): elapsed = time.time() - startTime print "%fs %s" % (elapsed, logString) startTime = time.time() print_elapsed("before connect") api = API( url="https://my.engine.url/api", username="user@domain", password="password", ca_file="./ca.crt", ) print_elapsed("after connect") print_elapsed("before fetch list") vmList = api.vms.list() print_elapsed("after fetch list") print_elapsed("before use list") count = 0 for vm in vmList: vmName = vm.get_name() count += 1 print "\t number of VMs %d" % count [3] Example of output: [grendelmans@bungee src]$ /usr/bin/time ./vm_list_test.py 0.000003s before connect 0.338248s after connect 0.338299s before fetch list 6.795967s after fetch list 6.796041s before use list number of VMs 26 6.796181s after use list 7.28user 0.05system 0:07.64elapsed 96%CPU (0avgtext+0avgdata 84624maxresident)k 0inputs+0outputs (0major+5605minor)pagefaults 0swaps [grendelmans@bungee src]$ _______________________________________________ Users mailing list Users(a)ovirt.org http://lists.ovirt.org/mailman/listinfo/users