Without this patch, one is limited to '(FD_SETSIZE - 10)’ number of connections.
Example of something that fails without this patch but works with the patch:
Without the patch:
$ pgbench -j 3000 -c 1500
invalid number of clients: "1500"
With the patch:
$ pgbench -j 3000 -c 1500
starting vacuum...end.
transaction type: <builtin: TPC-B (sort of)>
scaling factor: 2000
query mode: simple
number of clients: 1500
number of threads: 1500
number of transactions per client: 10
number of transactions actually processed: 15000/15000
latency average = 631.730 ms
tps = 2374.430587 (including connections establishing)
tps = 4206.524986 (excluding connections establishing)
--
doug
On 10/26/17, 04:46, "Robert Haas" <robertmhaas@gmail.com> wrote:
On Mon, Sep 25, 2017 at 8:01 PM, Rady, Doug <radydoug@amazon.com> wrote: > This patch enables building pgbench to
useppoll() instead of select() > > to allow for more than (FD_SETSIZE - 10) connections. As implemented, > >
whenusing ppoll(), the only connection limitation is system resources. So what's an example of something that
failswithout this patch but works with the patch? -- Robert Haas EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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