Commits on Aug 7, 2023

1. Enable Shared-Cache Mode for opened database …

   According to documentation this mode can increase database
   performance: https://www.sqlite.org/sharedcache.html
   
   My tests showed improvement both when using 1 client
   and 100 clients.
   
   For sigle client the throughput increased by 14%.
   For 100 clients the throughput increased by 27%.
   On the same time latencies have been lowered.
   
   The results for sqld running locally:
   
   1 client with no sharedcache:
       Summary:
           Total:        60.0012 secs
           Slowest:      0.0221 secs
           Fastest:      0.0009 secs
           Average:      0.0011 secs
           Requests/sec: 895.4821
   
       Latency distribution:
           10% in 0.0009 secs
           25% in 0.0010 secs
           50% in 0.0011 secs
           75% in 0.0012 secs
           90% in 0.0013 secs
           95% in 0.0014 secs
           99% in 0.0018 secs
   
   1 client with sharedcache:
       Summary:
           Total:        60.0008 secs
           Slowest:      0.0187 secs
           Fastest:      0.0008 secs
           Average:      0.0010 secs
           Requests/sec: 1042.3534
       Latency distribution:
           10% in 0.0008 secs
           25% in 0.0009 secs
           50% in 0.0009 secs
           75% in 0.0010 secs
           90% in 0.0011 secs
           95% in 0.0012 secs
           99% in 0.0016 secs
   
   100 clients with no sharedcache:
       Summary:
           Total:        60.0359 secs
           Slowest:      0.0962 secs
           Fastest:      0.0103 secs
           Average:      0.0368 secs
           Requests/sec: 2716.9230
       Latency distribution:
           10% in 0.0311 secs
           25% in 0.0338 secs
           50% in 0.0368 secs
           75% in 0.0396 secs
           90% in 0.0422 secs
           95% in 0.0439 secs
           99% in 0.0480 secs
   
   100 clients with sharedcache:
       Summary:
           Total:        60.0218 secs
           Slowest:      0.0828 secs
           Fastest:      0.0075 secs
           Average:      0.0267 secs
           Requests/sec: 3744.2703
       Latency distribution:
           10% in 0.0225 secs
           25% in 0.0242 secs
           50% in 0.0262 secs
           75% in 0.0287 secs
           90% in 0.0314 secs
           95% in 0.0332 secs
           99% in 0.0377 secs
   
   Signed-off-by: Piotr Jastrzebski <[email protected]>

   

   haaawk committed Aug 7, 2023
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