在内核中很多地方都充斥着 likely、unlikely 这一对儿函数的使用。随便揪两处，比如在 TCP 连接建立的过程中的这两个函数。...今天我就来和大家聊聊 likely、unlikely 是如何帮助性能提升的。 1. likely 和 unlikely 咱们先来挖挖这对儿函数的底层实现。...//file: include/linux/compiler.h #define likely(x) __builtin_expect(!!...小结 总结一下，今天分享的 likely 和 unlikely 其实是属于是辅助 CPU 分支预测的性能优化方法。这就是 likely 和 unlikely 背后的这点小秘密。...Linux 作为一个基础程序，在性能上真的是考虑到了极致。内核的作者们内功都是非常的深厚，都深谙计算机的底层工作原理。为了极致的性能追求精心打磨每一个细节，非常值得我们学习和借鉴。
This is very likely to create a memory leak 其实看日志发现, HikariPool 资源最后是释放了的, 只不过是稍微晚了一点 网上关于这个问题的解决方案很少
前两天因为用到isBlank,上网查了下，顺便放在CSDN上，希望能帮助到更多的人！！！
chrome 使用close()的时候：Python is likely shutting down Markdown here果然是神器，再也不用担心排版问题了，感谢Sean小伙伴的推荐 遇到问题 1.../www.cnblogs.com/yoyoketang") driver.close() # close这句报错了 3.报错信息：sys.meta_path is None, Python is likely...service.py", line 110, in send_remote_shutdown_command ImportError: sys.meta_path is None, Python is likely
It is likely that the cache is unavailable....It is likely that the cache is unavailable. 意思大概是: 因为它周期性连接到非本地缓存有问题。官网写的有bug。
curl -Lo minikube http://kubernetes.oss-cn-hangzhou.aliyuncs.com/minikube/releases/v0.25.2/minikube-linux-amd64...registry.docker-cn.com curl -Lo kubectl https://storage.googleapis.com/kubernetes-release/release/v1.9.4/bin/linux...\n\t Please install the virtualbox-dkms package and the appropriate\n\t headers, most likely linux-headers-generic...install virtualbox-dkms Please install the virtualbox-dkms package and the appropriate headers, most likely...linux-headers-generic.
部署环境 centos7 64位 elasticsearch 6.3.0 之前一开始用的32位，后来报错 elasticsearch6.3版本依赖的X-pack插件不支持32位 所以用的64位linux...版本的jdk http://www.oracle.com/technetwork/java/javase/downloads/index.html window发送文件到linux可以使用xshell，...file descriptors [4096] for elasticsearch process likely too low, increase to at least [65536] max number...of threads [1024] for user [elasticsearch] likely too low, increase to at least [4096] max virtual memory...areas vm.max_map_count [65530] likely too low, increase to at least [262144] 切换到root用户 修改linux默认配置
进行对应平台下载es,271M,网速慢的需要耐心等待 wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-7.3.0-linux-x86..._64.tar.gz 4.解压安装包 tar -zxvf elasticsearch-7.3.0-linux-x86_64.tar.gz 5.进入到bin目录下 cd elasticsearch-7.3.0...OpenJDK 64-Bit Server VM warning: Option UseConcMarkSweepGC was deprecated in version 9.0 and will likely...问题1:max file descriptors [4096] for elasticsearch process likely too low, increase to at least [65536...] 问题2:max number of threads [1024] for user [lishang] likely too low, increase to at least [2048] 在root
Hardware Random Number Generators on Intel Chipsets If you’re running Linux or one of the BSDs on...Recent kernels of Linux, OpenBSD, FreeBSD, and NetBSD all include drivers for these devices....Unfortunately, it’s likely that few people ever got RNGs in their chipsets....The newer your mainboard with an Intel chipset, the less likely it is that you have an RNG onboard....Also unfortunately, the Linux and *BSD drivers and daemons will not necessarily, as of this writing,
Q: I'm having problems installing Linux or X. Can you help?...Throw out that Microsoft trash and install Linux. Q: I'm having problems installing Linux or X....Go ask your local Linux user group for hands-on help. (You can find a list of user groups here.)...form of that last question is closely based on a real incident that happened in August 2001 on the linux-kernel...For popular software like Linux, there are are at least 10,000 users per developer.
❝来自于linux内核中的一段代码挺有意思的，分享给大家。❞ 下列代码的目的是「将"分支转移"的信息提供给编译器，这样可以让编译器对其代码进行优化，以减少指令跳转带来的性能下降」。...#define likely(x) __builtin_expect(!!...(x), 0) /* x很可能为假 */ 例如： if (likely(var)) /* if (var) */ if (unlikely(var)) /* if (!
使用心得linux版本，就不会出现此类问题了。...ERROR: bootstrap checks failed max file descriptors [4096] for elasticsearch process likely too low,...increase to at least [65536] max number of threads [1024] for user [lishang] likely too low, increase...to at least [2048] max virtual memory areas vm.max_map_count [65530] likely too low, increase to at...vm.max_map_count=655360" >>/etc/sysctl.conf 4、max file descriptors [65535] for elasticsearch process likely
# 解压Elasticsearch su tlbaiqi cd /user/local/ tar -zvxf elasticsearch-7.6.1-linux-x86_64.tar.gz -C /usr...4.2.1 普通用户打开文件的最大数限制 问题错误信息描述： max file descriptors [4096] for elasticsearch process likely too low,...nproc 4096 4.2.2 此文件修改后需要重新登录用户，才会生效 普通用户启动线程数限制 问题错误信息描述 max number of threads [1024] for user [es] likely...too low, increase to at least [4096] 修改普通用户可以创建的最大线程数 max number of threads [1024] for user [es] likely...1024#修改为 * soft nproc 4096 4.2.3 普通用户调大虚拟内存 错误信息描述： max virtual memory areas vm.max_map_count [65530] likely
es/data 命令五：mkdir -p es/logs 启动遇到的问题： 1）max file descriptors [4096] for elasticsearch process likely...添加如下内容: * soft nofile 65536 * hard nofile 131072 * soft nproc 2048 * hard nproc 4096 备注：* 代表Linux...2）max number of threads [1024] for user [es] likely too low, increase to at least [2048] 原因：无法创建本地线程问题...找到如下内容： * soft nproc 1024 #修改为 * soft nproc 2048 3）max virtual memory areas vm.max_map_count [65530] likely
本文通过Linux进程调度的5类方式详细分析了策略以及实现过程中的详细讲解。...1、Linux 下进程分为5种类别，分别是停止类、截止类、实时类、公平类、空闲类， 每种类别都有一个运行队列，每次调度时，就是先按照类别优先级排序，再按照每个类别内的最高优先级任务调度运行。 ?...文件：core.c (linux-4.6\kernel\sched) ? 解读：先看下面的for循环，可以看到实现思路是，遍历每种类别，选择下一个可运行的任务。...由于大部分任务都属于公平队列，所以，绝大部分情况下，都在公平队列中进行选择，所以，内核开发者在上面的代码中加了likely()提高性能。 ? ? ? ? ? ?...schedule() — >__schedule ()— > pick_next_task() 文件：core.c (linux-4.6\kernel\sched) ? ? 。。。。。。
默认配置 为什么要修改linux配置？...2048 * hard nproc 65536 相关错误信息：max file descriptors [4096] for elasticsearch process likely...1024 修改为 * soft nproc 2048 相关问题：max number of threads [1024] for user [judy2] likely...如果启动未成功，请去查看相关日志 vim /var/log/elasticsearch/my-es.log 10.安装kibana [1]解压tar -zxvf kibana-5.6.4-linux-x86...elasticsearch.url: "http://192.168.70.129:9200" [3]执行bin目录下的kibana程序 cd /opt/kibana-5.6.4-linux-x86
really doing By using Performance Monitoring Counters (PMCs): hardware counters that can be read using Linux...Interpretation and actionable items If your IPC is 1.0, you are likely instruction bound....As for top(1), there is tiptop(1) for Linux, which shows IPC by process: tiptop - [root...An IPC 1.0 likely means instruction bound.
1、今天在测试assembly的时候，在Linux虚拟机，内存配置为512mb，然后开始在Linux上运行assembly的时候就会一直卡住 ?...8.0 Java HotSpot(TM) 64-Bit Server VM warning: UseCMSCompactAtFullCollection is deprecated and will likely...---- 4、启动Linux并运行我们的assemble，大功告成！ ? ps： 你察觉到了日志的强大了吗？
ubuntu 12.04 you can probably install the debian libraries into quantal with no issues, precise is less likely...-* $sudo mk-build-deps -ir $debuild -us -uc 上述方法现在已经不适用,Google后发现,可以直接使用hdf5二进制包,由于本机为64bit linux...,下载64位下的二进制包： $wget http://www.hdfgroup.org/ftp/HDF5/releases/hdf5-1.8.9/bin/linux-x86_64/hdf5-1.8.9...-linux-x86_64-shared.tar.gz 解压后，并在.bashrc中设置： $export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local.../lib:$HOME/hdf5-1.8.9-linux-x86_64-shared/lib $export HDF5_DIR=$HOME/hdf5-1.8.9-linux-x86_64-shared
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