Re: PATCH: pgbench / int64 instead of int for xact count

On 25.5.2014 20:32, Tom Lane wrote:
> Tomas Vondra <tv(at)fuzzy(dot)cz> writes:
>> On 25.5.2014 19:05, Andres Freund wrote:
>>> That's not right though. On windows a long (indicated by the %l) is only
>>> 4 bytes wide. Check INT64_FORMAT. That's generated by configure/platform
>>> template files and should always be correct.
>
>> Oh, right. v2 of the patch attached.
>
> Hm ... if normal_xacts can overflow an int, shouldn't we expect that
> the product nxacts * nclients could?

Maybe, but I saw that as a separate thing, mostly unrelated to the
'hardware got so fast it can overflow' problem. Because nxacts is the
parameter we use to define duration, so if it din't overflow in the
past, it won't overflow today.

OTOH, thanks to hardware improvements we tend to use more clients /
higher number of transactions, so fixing this seems like a good idea.

Should we change the type of nxacts to int64 (thus allowing '-t' with
64-bit integers), or just the overflow in the printf call? I don't find
it very practical to use -t with values not fitting into 32-bits (the -T
seems better to do that), so I'm inclined to just fix the printf. Patch
v3 attached.

Tomas