Peter Eisentraut wrote:
One frequent source of confusion are the different units that the parameters
in postgresql.conf use. shared_buffers is in 8 kB, work_mem is in 1 kB;
bgwriter_delay is in milliseconds, checkpoint_warning is in seconds.
Obviously, we can't change that without inconveniencing a lot of users.
I think it would be useful to allow units to be added to these settings, for
example
shared_buffers = 1000kB
checkpoint_warning = 30s
This would also allow
shared_buffers = 512MB
which is a bit cumbersome to calculate right now (you'd need = 65536).
I haven't thought yet how to parse or implement this, but would people find
this useful?
It is good idea. I going to implement this. There is some proposal:
Time units is easy:
1h = 60min = 3600s = 3600000ms
Memory units:
What kind of unit prefix will we use for memory? 1kB=1000B and
1kiBi=1024B or 1kB=1024kB. See
http://en.wikipedia.org/wiki/Binary_prefix for detail. I suggest use IEC
standard convention. By my opinion it is much better.
And there are some other questions:
1) will be unit required? What will be default unit for value without unit?
I suggest mandatory unit avoid the problem with unclear default value.
2) Each internal representation of setting use different unit. Shell I
convert this representation to milliseconds and bytes? I think it is not
good idea. It should generate some overflow. I suggest to recompute
value and round it to integer.
Zdenek
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