I’m no expert here, but here’s something: Box 1, no NUMA: ~$ dmesg | grep -i numa [ 0.000000] No NUMA configuration found Box 2, some NUMA: ~$ dmesg | grep -i numa [ 0.000000] NUMA: Initialized distance table, cnt=8 [ 0.000000] NUMA: Node 4 [0,80000000) + [100000000,280000000) -> [0,280000000)
SSE instructions are processor specific. You can look up which processor supports which SSE version on wikipedia. If SSE code will be faster or not depends on many factors: The first is of course whether the problem is memory-bound or CPU-bound. If the memory bus is the bottleneck SSE will not help much. Try simplifying … Read more
Let’s try to answer this question by looking at people versus computers; hopefully this will shed some light on things for you: Things to Keep In Mind As amazing as they are, computers are very, very dumb. Memory People have memory (with the exception, arguably, of husbands and politicians.) People store information in their memory … Read more
Best Resources: Main QEMU Usage Documentation Qemu Man Page – Invaluable resource when working with qemu. Quick Start Guide – Slightly ubuntu/debian specific. Covers KVM. Qemu Networking Guide – Great resource, super useful. Have fun qemu’s a great tool.
EDIT: Problem solved. I have to shout out a huge Sorry to the community and a big thank you for your hints. Sorry to user anonymous, who seems to be involved into kernel development. What happened? We spent another 2 days debugging and fiddling around with the program code. No implementation problems were found. BUT: … Read more
Your assumption about sizeof(int) is untrue; see this. Since you must know the processor, OS and compiler at compilation time, the word size can be inferred using predefined architecture/OS/compiler macros provided by the compiler. However while on simpler and most RISC processors, word size, bus width, register size and memory organisation are often consistently one … Read more
LOS for Large Object Space… it is possible for Java objects used by native code to be kept alive for too long. Some objects on the Java heap may become unreachable see if this documentation can help https://developer.android.com/studio/profile/memory-profiler#LogMessages
L1 is very tightly coupled to the CPU core, and is accessed on every memory access (very frequent). Thus, it needs to return the data really fast (usually within on clock cycle). Latency and throughput (bandwidth) are both performance-critical for L1 data cache. (e.g. four cycle latency, and supporting two reads and one write by … Read more
If the event of interest is: Asynchronous Urgent Infrequent then an interrupt based handler would make sense. If the event of interest is: Synchronous (i.e. you know when to expect it within a small window) Not Urgent (i.e. a slow polling interval has no ill effects) Frequent (i.e. majority of your polling cycles create a … Read more
Superscalar design involves the processor being able to issue multiple instructions in a single clock, with redundant facilities to execute an instruction. We’re talking about within a single core, mind you — multicore processing is different. Pipelining divides an instruction into steps, and since each step is executed in a different part of the processor, … Read more