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)


On 10/26/17, 04:46, "Robert Haas" <robertmh...@gmail.com> wrote:

    On Mon, Sep 25, 2017 at 8:01 PM, Rady, Doug <radyd...@amazon.com> wrote:
    > This patch enables building pgbench to use ppoll() instead of select()
    > to allow for more than (FD_SETSIZE - 10) connections.  As implemented,
    > when using ppoll(), the only connection limitation is system resources.
    So what's an example of something that fails without this patch but
    works with the patch?
    Robert Haas
    EnterpriseDB: http://www.enterprisedb.com
    The Enterprise PostgreSQL Company

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