Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>Drain it each time. As others have said draining an autorelease pool is cheap.</p> <p>Moreover NOT draining it <strong>can</strong> be very costly. If you have enough stuff in your autorelease pool to cause paging you cause disk I/O, and disk I/O is literally thousands if not millions of times more costly then running a linked list calling release on stuff. (and on systems like iOS that don't have paging, lots of extra objects waiting to autorelease can cause memory low warnings, which might cause applications to be forced to exit, or the foreground application to go release a bunch of Nib views or something, then it then has to recreate later...or it might just force your application to exit).</p> <p>Even if you don't use "enough" extra memory to cause low memory warnings or paging you will be running a larger staler list of items to drain. More memory accesses will be between your newest autorelease item and the oldest. There is a much greater chance that the oldest autorelease item is now farther away in the memory hierarchy, so your release may have cache misses vs. a L1 or L2 cache hit. So maybe 100 times more costly. Plus the memory you would have released (and might have been hot in the cache) might well have been reused by another object.</p> <p>So doing the autorelease every 50 to 100 times might not even manage to be premature optimization.</p> <p>Do one release per loop, and then if that shows as a bottleneck make it every X times, and make sure that makes it faster not slower.</p>
    singulars
    1. This table or related slice is empty.
    1. POBest way to periodically drain the autorelease pool on a long-running background thread?
      singulars
      1. PTQuestion
    1. PTAnswer
    1. This table or related slice is empty.
    1. USStripes
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload