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Why is f(i = -1, i = -1) undefined behavior?
...signment cannot be interleaved. It might be optimal to do so, depending on CPU architecture. The referenced page states this:
If A is not sequenced before B and B is not sequenced before A, then
two possibilities exist:
evaluations of A and B are unsequenced: they may be performed in ...
Why does Math.round(0.49999999999999994) return 1?
...s (CPU, 32- or 64-bit mode).
And, when using round or inverting matrices, etc., these bits can make a huge difference.
x64 output:
10.5 rounded is 11
10.499999999999998 rounded is 10
9.5 rounded is 10
9.499999999999998 rounded is 9
8.5 rounded is 9
8.499999999999998 rounded is 8
7.5 rounded is 8
...
Foreign keys in mongo?
...lumns are Fields... Just in case you get mixed up.
– cpu_meltdown
Jun 2 '16 at 13:39
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show 2 more comments
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What does Redis do when it runs out of memory?
...OC-STATS - Show allocator internal stats"
/usr/local/etc/redis.conf
############################## MEMORY MANAGEMENT ################################
# Set a memory usage limit to the specified amount of bytes.
# When the memory limit is reached Redis will try to remove keys...
What is “thread local storage” in Python, and why do I need it?
...created a byte-code chunk that left no room for an interrupt signal to the CPU.
I thought atomic operations are chunks of Python byte code that does not give access to interrupts. Python statements like "running = True" is atomic. You do not need to lock CPU from interrupts in this case (I believe)...
Does “display:none” prevent an image from loading?
...ng that there's just a JS solution to the problem (lazy load, picturefill, etc.), it appeared that there's a nice pure HTML solution that comes out of the box with HTML5.
And that is the <picture> tag.
Here's how MDN describes it:
The HTML <picture> element is a container used t...
A fast method to round a double to a 32-bit int explained
...t-of-order execution, altering the fp rounding mode generally seriales the CPU core and is quite expensive. So on a CPU like a Pentium-III or Pentium-IV, this overall cost is quite high -- a normal fp->int conversion is 10x or more expensive than this add+store+load trick.
On x86-64, however, fl...
What platforms have something other than 8-bit char?
...
Control Data mainframes (CDC-6400, 6500, 6600, 7600, Cyber 170, Cyber 176 etc.) 6-bit chars, packed 10 per 60-bit word.
Unisys mainframes: 9 bits/byte
Windows CE: simply doesn't support the `char` type at all -- requires 16-bit wchar_t instead
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Java Programming - Where should SQL statements be stored? [closed]
...ia for UI queries, well-defined queries (reporting / service interaction / etc...) should all be in HQL.
– ChssPly76
Nov 2 '09 at 22:29
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sh...
Difference between malloc and calloc?
...e client process. This works same way memory mapped files, virtual memory, etc. work.. it uses paging.
Here is one optimization story about the topic:
http://blogs.fau.de/hager/2007/05/08/benchmarking-fun-with-calloc-and-zero-pages/
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