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Java 8 Streams: multiple filters vs. complex condition
...arge array 1,000,000 elements throughput ops/s:
NOTE: tests runs on
8 CPU
1 GB RAM
OS version: 16.04.1 LTS (Xenial Xerus)
java version: 1.8.0_121
jvm: -XX:+UseG1GC -server -Xmx1024m -Xms1024m
UPDATE:
Java 11 has some progress on the performance, but the dynamics stay the same
Benchmark mo...
【BLE技术内幕】BLE技术揭秘 - 创客硬件开发 - 清泛IT论坛，有思想、有深度
...用send_LL(0x53,2402M)（注：2402M为信道频率）。这里还有一个问题，设备B怎么知道这个数据包是发给自己的还是其他人的，为此BLE引入access address概念，用来指明接收者身份，其中，0x8E89BED6这个access address比较特殊，它表示要发给周...
Lock, mutex, semaphore… what's the difference?
...r of threads to enter, this can be used for example to limit the number of cpu, io or ram intensive tasks running at the same time.
For a more detailed post about the differences between mutex and semaphore read here.
You also have read/write locks that allows either unlimited number of readers or...
What is an uninterruptible process?
... no non-sleeping process, it switches to a "dummy" process which tells the cpu to slow down a bit and sits in a loop — the idle loop).
If a signal is sent to a sleeping process, it has to be woken up before it will return to user space and thus process the pending signal. Here we have the differe...
Which is faster/best? SELECT * or SELECT column1, colum2, column3, etc
...s - go ahead, vote me down - but in my world, developer time is scarce and CPU cycles are abundant, so I adjust accordingly what I conserve and what I waste.
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Is 'switch' faster than 'if'?
...h statement provokes the compiler into sending the value directly into the CPU registers rather than putting it on the stack first. This is therefore in favour of the switch statement and not a balanced test.
Oh and I think you should also reset counter between tests. In fact, you probably should b...
Why is lock(this) {…} bad?
...t deciding what to lock. Be aware that taking a lock involves cache-flush CPU operations and is somewhat expensive. In other words: do not lock and update each individual integer. :)
– Zan Lynx
Oct 31 '08 at 0:12
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Java Programming - Where should SQL statements be stored? [closed]
...k-in in the java world is interesting.
I hope you haven't paid $50000 pr CPU for Oracle Enterprise, and then only used the least common denominator in order to switch to Mysql any minute. As any good DBA will tell you, there are subtle differences between the different big name databases, especial...
Undefined, unspecified and implementation-defined behavior
...bar), where bar is an int and boz() is a function returning int. Assume a CPU where parameters are expected to be passed in registers R0-R1. Function results are returned in R0; functions may trash R1. Evaluating "bar" before "boz()" would require saving a copy of bar somewhere else before callin...
What is the overhead of creating a new HttpClient per call in a WebAPI client?
...ster than they could be closed - server port exhaustion which hammered the CPU to 100%. My fix was to change the HttpClient to a static instance which solved the problem. Yes, it is a disposable resource, but any overhead is vastly outweighed by the difference in performance. I encourage you to do ...