Tag: pike

Ubuntu installs riscv-gnu-toolchain compilation chain and spike, pk usage guide

riscv-gnu-toolchain compilation chain and spike, pk installation and usage guide 1. Environment: Ubuntu18.04 2. Install dependency packages (needed for various compilations): $ sudo apt install autoconf automake autotools-dev curl python3 libmpc-dev libmpfr-dev libgmp-dev gawk build-essential bison flex texinfo gperf libtool patchutils bc zlib1g-dev libexpat-dev 3. Differentiate between downloading riscv-gnu-toolchain and riscv-tools As for why we […]

Improper new ArrayList causes CPU spike. .

Source: juejin.cn/post/7139202066362138654 Preface The scene at that time Normal jvm monitoring curve chart The jvm monitoring curve that caused the problem Specific analysis Conclusion Yesterday, the CPU of the online container suddenly surged. This is the first time to troubleshoot this problem, so I will record it~ Foreword First of all, the problem is this. […]

Improper new ArrayList causes CPU to spike. .

Click to follow the official account, Java dry goodsDelivery in time Dog Xiaoha Tutorial Network : www.quanxiaoha.com Source: juejin.cn/post/7139202066362138654 Preface The scene at that time Normal jvm monitoring curve chart The jvm monitoring curve that caused the problem Specific analysis conclusion Yesterday, the CPU of the online container suddenly surged. This is the first time […]

Redis uses lua to solve the problem of spike inventory

Advantages of LUA scripts in Redis – Write a complex or multi-step redis operation as a script, and submit it to redis for execution at one time, reducing the number of repeated connections to redis. Improve performance. – LUA scripts are similar to redis transactions, have certain atomicity, will not be queued by other commands, […]

Improper new ArrayList causes CPU to spike. .

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jsp+servlet spike and bidding auction system based on javaweb+mysql (java+jsp+bootstrap+jquery+mysql)

jsp + servlet seckill and bidding auction system based on javaweb + mysql (java + jsp + bootstrap + jquery + mysql) operating environment Java≥8, MySQL≥5.7, Tomcat≥8 development tools eclipse/idea/myeclipse/sts can be configured to run Be applicable Course design, major assignments, graduation design, project exercises, learning presentations, etc. Function Description JSP + Servlet seckill and […]

jsp+servlet spike and bidding auction system based on javaweb+mysql (java+jsp+bootstrap+jquery+mysql)

jsp + servlet seckill and bidding auction system based on javaweb + mysql (java + jsp + bootstrap + jquery + mysql) operating environment Java≥8, MySQL≥5.7, Tomcat≥8 development tools eclipse/idea/myeclipse/sts can be configured to run Be applicable Course design, major assignments, graduation design, project exercises, learning presentations, etc. Function Description JSP + Servlet seckill and […]

Design spike system under high concurrency

Design a spike system under high concurrency (similar to regular snap-ups during the epidemic) Article directory core logic Supplementary background knowledge What is a bloom filter? How to deduct inventory with redis? What is the difference between cache breakdown and cache penetration? Why should the order be set as an asynchronous request? Phenomenon: In the […]

Seven ways to achieve high concurrency spike!

1 Introduction 2. Commodity spike – oversold 3. Solve oversold goods 3.1 Method 1 (improved version locking) 3.2 Method 2 (AOP version lock) 3.3 Method 3 (pessimistic lock 1) 3.4 Method 4 (pessimistic lock 2) 3.5 Method 5 (optimistic lock) 3.6 Method 6 (blocking queue) 3.7. Method 7 (Disruptor queue) summary 1. Introduction High-concurrency scenarios […]