Hi Justin, I tried both the way, pg_dump and rsync of complete data_directory, but the result is same.
Both the db's configurations are not same, I have tuned the db in both machines according to https://pgtune.leopard.in.ua/#/ Below is the result of explain (analyze, buffer, settings) of both the db's. High End Machine IPDS_KSEB=# set track_io_timing TO on; SET IPDS_KSEB=# explain (analyze,buffers, settings) select * from kseb_geometry_trace_with_barrier_partition(5,'kottarakara_version',437,'htline',2) ; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------- ---------------------------------------------- Function Scan on kseb_geometry_trace_with_barrier_partition (cost=0.25..10.25 rows=1000 width=169) (actual time=24708.020..24708.048 rows=254 loops=1) Buffers: shared hit=254235 read=1484 I/O Timings: read=827.509 Settings: effective_cache_size = '30GB', effective_io_concurrency = '2', max_parallel_workers = '24', max_parallel_workers_per_gather = '4', search_path = ' "$user", public, topology', work_mem = '10MB' Planning Time: 0.064 ms Execution Time: 24772.587 ms (6 rows) Low End Machine IPDS_KSEB=# explain (analyze,buffers, settings) select * from kseb_geometry_trace_with_barrier_partition(5,'kottarakara_version',437,'htline',2) ; QUERY PLAN --------------------------------------------------------------------------------------------------------------------------------------------------------- Function Scan on kseb_geometry_trace_with_barrier_partition (cost=0.25..10.25 rows=1000 width=169) (actual time=21870.311..21870.344 rows=389 loops=1) Buffers: shared hit=774945 Settings: search_path = '"$user", public, topology' Planning Time: 0.089 ms Execution Time: 21870.406 ms (5 rows) On Thu, Jul 16, 2020 at 9:34 PM Justin Pryzby <pry...@telsasoft.com> wrote: > On Thu, Jul 16, 2020 at 09:13:45PM +0530, Vishwa Kalyankar wrote: > > Hi, > > > > I have two machines - one with 8GB RAM & 4core CPU and the other with > 64GB > > Ram & 24 core CPU. Both machines have the same DB (Postgres 12 + Postgis > > 2.5.3). Same query is taking less time in low end machine whereas more > > time in high end machine. Any thoughts on where to look? I have tuned > the > > When you say "the same DB" what do you mean ? > Is one a pg_dump and restore of the other ? > Or a physical copy like rsync/tar of the data dir ? > > > Please find the attachment for query explain & analyze and bonnie > result > > of both the machines. > > Are the DB settings the ame or how do they differ ? > > Maybe you could send explain(analyze,buffers,timing,settings) ? > https://wiki.postgresql.org/wiki/Slow_Query_Questions > > -- > Justin >
