rps runner starts threads simultaneously

[Oleh Anufriiev]

RPS runner should start threads inside processes with some time shift.
This was implemented to perform load more evenly.

config:

{
    "VMTasks.boot_runcommand_delete": [
        {
            "args": {
                "flavor": {
                    "name": "m1.tiny"
                },
                "nics": [
                  {
                    "net-id": "01f78bed-32e2-4a4d-bde4-287b9cb6b12a"
                 }
                ],
                "image": {
                    "name": "cirros"
                },
                "floating_network": "ext_net",
                "use_floating_ip": true,
                "force_delete": true,
                "script": "samples/tasks/support/instance_dd_test.sh",
                "interpreter": "/bin/sh",
                "username": "cirros"
            },
            "runner": {
                "type": "rps",
                "times": 40,
                "rps": 0.5,
                "timeout": 1
            },
            "context": {
                "users": {
                    "tenants": 1,
                    "users_per_tenant": 1
                },
                 "quotas": {
                     "nova": {
                         "instances": -1,
                         "cores": -1,
                         "ram": -1
                     },
                      "neutron": {
                         "port": 300,
                         "floatingip": -1,
                         "subnet": -1,
                         "router": -1,
                         "network": -1,
                         "security_group": -1
                      }
                 }
            }
        }
    ]
}

output:

 cls: <class 'rally.benchmark.scenarios.vm.vmtasks.VMTasks'>
2015-08-10 18:41:27.700 27736 INFO rally.benchmark.runners.base [-] Task 6a89973a-b95f-4513-88cb-501e5581d1dd | ITER: 1 START
2015-08-10 18:41:27.700 27736 RALLYDEBUG rally.plugins.common.runners.rps [-] Worker: 1 rps: 0.499582103774 (requested rps: 0.125)
2015-08-10 18:41:29.702 27738 INFO rally.benchmark.runners.base [-] Task 6a89973a-b95f-4513-88cb-501e5581d1dd | ITER: 2 START
2015-08-10 18:41:29.702 27738 RALLYDEBUG rally.plugins.common.runners.rps [-] Worker: 1 rps: 0.249853473406 (requested rps: 0.125)
2015-08-10 18:41:31.704 27739 INFO rally.benchmark.runners.base [-] Task 6a89973a-b95f-4513-88cb-501e5581d1dd | ITER: 3 START
2015-08-10 18:41:31.704 27739 RALLYDEBUG rally.plugins.common.runners.rps [-] Worker: 1 rps: 0.166598361258 (requested rps: 0.125)
2015-08-10 18:41:33.698 27735 RALLYDEBUG rally.plugins.common.runners.rps [-] Worker: 2 rps: 0.249960533056 (requested rps: 0.125)
2015-08-10 18:41:33.699 27735 INFO rally.benchmark.runners.base [-] Task 6a89973a-b95f-4513-88cb-501e5581d1dd | ITER: 4 START
2015-08-10 18:41:33.699 27736 INFO rally.benchmark.runners.base [-] Task 6a89973a-b95f-4513-88cb-501e5581d1dd | ITER: 5 START
2015-08-10 18:41:33.699 27736 RALLYDEBUG rally.plugins.common.runners.rps [-] Worker: 2 rps: 0.249978849591 (requested rps: 0.125)
2015-08-10 18:41:33.701 27738 INFO rally.benchmark.runners.base [-] Task 6a89973a-b95f-4513-88cb-501e5581d1dd | ITER: 6 START
2015-08-10 18:41:33.701 27738 RALLYDEBUG rally.plugins.common.runners.rps [-] Worker: 2 rps: 0.249984257915 (requested rps: 0.125)
2015-08-10 18:41:33.703 27739 INFO rally.benchmark.runners.base [-] Task 6a89973a-b95f-4513-88cb-501e5581d1dd | ITER: 7 START
2015-08-10 18:41:33.703 27739 RALLYDEBUG rally.plugins.common.runners.rps [-] Worker: 2 rps: 0.249964786066 (requested rps: 0.125)
2015-08-10 18:41:41.698 27735 INFO rally.benchmark.runners.base [-] Task 6a89973a-b95f-4513-88cb-501e5581d1dd | ITER: 8 START
2015-08-10 18:41:41.698 27735 RALLYDEBUG rally.plugins.common.runners.rps [-] Worker: 3 rps: 0.187490378069 (requested rps: 0.125)
2015-08-10 18:41:41.699 27736 INFO rally.benchmark.runners.base [-] Task 6a89973a-b95f-4513-88cb-501e5581d1dd | ITER: 9 START
2015-08-10 18:41:41.699 27736 RALLYDEBUG rally.plugins.common.runners.rps [-] Worker: 3 rps: 0.187493895379 (requested rps: 0.125)
2015-08-10 18:41:41.701 27738 INFO rally.benchmark.runners.base [-] Task 6a89973a-b95f-4513-88cb-501e5581d1dd | ITER: 10 START
2015-08-10 18:41:41.701 27738 RALLYDEBUG rally.plugins.common.runners.rps [-] Worker: 3 rps: 0.18748625748 (requested rps: 0.125)
2015-08-10 18:41:41.702 27739 INFO rally.benchmark.runners.base [-] Task 6a89973a-b95f-4513-88cb-501e5581d1dd | ITER: 11 START
2015-08-10 18:41:41.702 27739 RALLYDEBUG rally.plugins.common.runners.rps [-] Worker: 3 rps: 0.187491246908 (requested rps: 0.125)
2015-08-10 18:41:49.698 27735 INFO rally.benchmark.runners.base [-] Task 6a89973a-b95f-4513-88cb-501e5581d1dd | ITER: 12 START
2015-08-10 18:41:49.698 27735 RALLYDEBUG rally.plugins.common.runners.rps [-] Worker: 4 rps: 0.166658208203 (requested rps: 0.125)
2015-08-10 18:41:49.699 27736 INFO rally.benchmark.runners.base [-] Task 6a89973a-b95f-4513-88cb-501e5581d1dd | ITER: 13 START
2015-08-10 18:41:49.699 27736 RALLYDEBUG rally.plugins.common.runners.rps [-] Worker: 4 rps: 0.166662070613 (requested rps: 0.125)
2015-08-10 18:41:49.701 27738 INFO rally.benchmark.runners.base [-] Task 6a89973a-b95f-4513-88cb-501e5581d1dd | ITER: 14 START
2015-08-10 18:41:49.702 27738 RALLYDEBUG rally.plugins.common.runners.rps [-] Worker: 4 rps: 0.166653077916 (requested rps: 0.125)
2015-08-10 18:41:49.702 27739 INFO rally.benchmark.runners.base [-] Task 6a89973a-b95f-4513-88cb-501e5581d1dd | ITER: 15 START
2015-08-10 18:41:49.702 27739 RALLYDEBUG rally.plugins.common.runners.rps [-] Worker: 4 rps: 0.166662125248 (requested rps: 0.125)

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/212531

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/212531
Committed: https://git.openstack.org/cgit/openstack/rally/commit/?id=fc8415b0a8df8aaa640d7eb2bfd2bb24e696a407
Submitter: Jenkins
Branch: master

commit fc8415b0a8df8aaa640d7eb2bfd2bb24e696a407
Author: Oleh Anufriiev <email address hidden>
Date: Thu Aug 13 16:31:42 2015 +0300

    RPS thread start pause correction

    Correct calculation of pause between starting threads
    inside processes

    Change-Id: Ibfba44987886a1fd6e29064e6a7c65592e95d871
    Closes-Bug: #1484537