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drummers-lowrise
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Concurrently running 2 PPS sieve tasks on GPUs will increase throughput (more pronounced on GPUs with more FLOPS). I use the following app_config.xml (replace `<` with less than, and `>` with greater than):

<app_config>
<app_version>
<app_name>pps_sr2sieve</app_name>
<plan_class>cudaPPSsieve</plan_class>
<avg_ncpus>0.1</avg_ncpus>
<ngpus>0.5</ngpus>
</app_version>
<app_version>
<app_name>pps_sr2sieve</app_name>
<plan_class>openclatiPPSsieve</plan_class>
<avg_ncpus>0.1</avg_ncpus>
<ngpus>0.5</ngpus>
</app_version>
</app_config>

GPU | t1 (seconds): time for 1 concurrent task | t2 (seconds): time for 2 concurrent tasks | Ratio of throughput of 2 over 1 concurrent task (2/(t2/t1))
AMD Radeon HD 5570 | 8290 | 15650 | 1.059
Nvidia GeForce GTX 1060 | 550 | 890 | 1.236
Nvidia GeForce GTX 1070 | 430 | 630 | 1.365
Nvidia GeForce GT 710 | Not independently tested
Nvidia GeForce GT 730 | 2260 | 4150* | 1.089

* My latest tasks' time with Nvidia GeForce GT 730 have decreased to around 3800 s because I discovered PPS sieve is receptive to overclocks higher than those in other projects.
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