常见问题 redis.clients.jedis.exceptions.JedisConnectionException: Could not get a resource from the pool...… Caused by: java.util.NoSuchElementException: Timeout waiting for idle object at org.apache.commons.pool2...redis.clients.jedis.exceptions.JedisConnectionException: Could not get a resource from the pool … Caused...by: java.util.NoSuchElementException: Pool exhausted at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject
会抛出如下异常: redis.clients.jedis.exceptions.JedisConnectionException: Could not get a resource from the pool...… Caused by: java.util.NoSuchElementException: Timeout waiting for idle object at org.apache.commons.pool2...= false redis.clients.jedis.exceptions.JedisConnectionException: Could not get a resource from the pool...… Caused by: java.util.NoSuchElementException: Pool exhausted at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject...numTestsPerEvictionRun 做空闲资源检测时,每次的采样数 3 可根据自身应用连接数进行微调,如果设置为-1,就是对所有连接做空闲监测 所有默认值可以从org.apache.commons.pool2
artifactId> 2.9.0 compile Jedis使用apache commons-pool2...1.资源“不足" redis.clients.jedis.exceptions.JedisConnectionException: Could not get a resource from the pool...… Caused by: java.util.NoSuchElementException: Timeout waiting for idle object at org.apache.commons.pool2...:449) 或者 redis.clients.jedis.exceptions.JedisConnectionException: Could not get a resource from the pool...… Caused by: java.util.NoSuchElementException: Pool exhausted at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject
一、使用方法 ----------------------------------------- private volatile static JedisPool pool = null; //本地测试...== null) { synchronized(RedisUtils.class) { if(pool == null) { pool...(jedis); } } catch (Throwable t) { logger.error("", t); if(pool !...… Caused by: java.util.NoSuchElementException: Timeout waiting for idle object at org.apache.commons.pool2...… Caused by: java.util.NoSuchElementException: Pool exhausted at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject
我们经常会在Jedis pool预热这一块用到这个参数。由于一些原因(如超时时间设置较小等),项目在启动成功后可能会出现超时。...不会等待资源释放: redis.clients.jedis.exceptions.JedisConnectionException: Could not get a resource from the pool...… Caused by: java.util.NoSuchElementException: Pool exhausted at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject...464) B.超时: redis.clients.jedis.exceptions.JedisConnectionException: Could not get a resource from the pool...… Caused by: java.util.NoSuchElementException: Timeout waiting for idle object at org.apache.commons.pool2
jstack导出线程快照发现, jstack >> jstack.log 大量处于WAITTING状态的线程,而这些线程都是在调用borrowObject方法,这个是apache common pool
redis.clients.jedis.exceptions.JedisConnectionException: Could not get a resource from the pool … Caused...by: java.util.NoSuchElementException: Timeout waiting for idle object at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject...redis.clients.jedis.exceptions.JedisConnectionException: Could not get a resource from the pool … Caused...by: java.util.NoSuchElementException: Pool exhausted at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject
sce.big, vars.to.regress = c("nCount_RNA"), model.use = 'linear', use.umi = FALSE)Error: vector memory exhausted
exhausted"); } } if (!...minIdle:对象池中空闲对象最小数量,默认为8 lifo:当去获取对象池中的空闲实例时,是否需要遵循后进先出的原则,默认为true blockWhenExhausted: 当对象池处于exhausted...状态,即可用实例为空时,是否阻塞来获取实例的线程,默认 true fairness:当对象池处于exhausted状态,即可用实例为空时,大量线程在同时阻塞等待获取可用的实例,fairness配置来控制是否启用公平锁算法...这一项的前提是blockWhenExhausted配置为true maxWaitMillis:最大阻塞时间,当对象池处于exhausted状态,即可用实例为空时,大量线程在同时阻塞等待获取可用的实例...] INFO com.anqi.demo.demopool2.pool.StringPoolTest - str:str-val- java.util.NoSuchElementException: Timeout
exhausted"); } } if (!...minIdle:对象池中空闲对象最小数量,默认为8 lifo:当去获取对象池中的空闲实例时,是否需要遵循后进先出的原则,默认为true blockWhenExhausted:当对象池处于exhausted...状态,即可用实例为空时,是否阻塞来获取实例的线程,默认 true fairness:当对象池处于exhausted状态,即可用实例为空时,大量线程在同时阻塞等待获取可用的实例,fairness配置来控制是否启用公平锁算法...这一项的前提是blockWhenExhausted配置为true maxWaitMillis:最大阻塞时间,当对象池处于exhausted状态,即可用实例为空时,大量线程在同时阻塞等待获取可用的实例...] INFO com.anqi.demo.demopool2.pool.StringPoolTest - str:str-val- java.util.NoSuchElementException: Timeout
exhausted"); } } if (!...对象中空闲对象最大数量,默认为8 minIdle:对象池中空闲对象最小数量,默认为8 lifo:当去获取对象池中的空闲实例时,是否需要遵循后进先出的原则,默认为true blockWhenExhausted:当对象池处于exhausted...状态,即可用实例为空时,是否阻塞来获取实例的线程,默认 true fairness:当对象池处于exhausted状态,即可用实例为空时,大量线程在同时阻塞等待获取可用的实例,fairness配置来控制是否启用公平锁算法...这一项的前提是blockWhenExhausted配置为true maxWaitMillis:最大阻塞时间,当对象池处于exhausted状态,即可用实例为空时,大量线程在同时阻塞等待获取可用的实例,如果阻塞时间超过了...] INFO com.anqi.demo.demopool2.pool.StringPoolTest - str:str-val- java.util.NoSuchElementException: Timeout
) if res.status_code == 200: print(f'{proxies}检测通过') with open('ips_pool.csv...'\n') except Exception as e: print(e) continue def get_proxies(ip_pool_name...='ips_pool.csv'): """ 从ip池获得一个随机的代理ip :param ip_pool_name: str,存放ip池的文件名, :return: 返回一个...proxies字典,形如:{'HTTPS': '106.12.7.54:8118'} """ with open(ip_pool_name, 'r') as f: datas...抓取完毕,时间:', t2 - t1) # check_local_ip('raw_ips.csv','http://www.baidu.com') 抓取的结果会保存在 当前目录下 ips_pool.csv
那么Android会否由于Message Pool缓存的Message对象而造成OOM呢? 对于这个问题,我能够明白的说APP不会因Message Pool而OOM。...至于为什么,能够一步步往下看,心急的能够直接看最后一节——Message Pool怎样存放Message。...剧透下这里的sPool事实上就是Message Pool Message Pool相关源代码分析 Message Pool数据结构 public final class Message implements...终于被缓存进Message Pool前都被置空,那么这些缓存的Message对象所占内存大小对于一个app内存来说基本能够忽略。所以说。Message Pool并不会造成App的OOM。...也是Message) Message Pool不会由于缓存Message对象而造成OOM。 pool链表的插入和获取操作都发生在表头,可以理解为用链表实现了栈。
当需要创建的子进程数量不多时,可以直接利用multiprocessing中的Process动态成生多个进程,但如果是上百甚至上千个目标,手动的去创建进程的工作量巨大,此时就可以用到multiprocessing模块提供的Pool...初始化Pool时,可以指定一个最大进程数,当有新的请求提交到Pool中时,如果池还没有满,那么就会创建一个新的进程用来执行该请求;但如果池中的进程数已经达到指定的最大值,那么该请求就会等待,直到池中有进程结束...,才会用之前的进程来执行新的任务,请看下面的实例: # -*- coding:utf-8 -*- from multiprocessing import Pool import os, time, random...random.random()*2) t_stop = time.time() print(msg,"执行完毕,耗时%0.2f" % (t_stop-t_start)) po = Pool...执行完毕,耗时0.75 9开始执行,进程号为21468 7 执行完毕,耗时1.03 8 执行完毕,耗时1.05 9 执行完毕,耗时1.69 -----end----- multiprocessing.Pool
artifactId> 2.9.0 compile Jedis使用Apache Commons-pool2...GenericObjectPoolConfig { public JedisPoolConfig() { // defaults to make your life with connection pool...setTimeBetweenEvictionRunsMillis(30000); setNumTestsPerEvictionRun(-1); } } 说明 可以在org.apache.commons.pool2...因此不会等待资源释放: redis.clients.jedis.exceptions.JedisConnectionException: Could not get a resource from the pool...… Caused by: java.util.NoSuchElementException: Pool exhausted at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject
所以会吧buffer pool会分成各种小的buffer pool,这些称为实例,他们都是独立去申请内存空间,独立管理的链表,并且在多线程访问的情况下互不影响,可以通过innodb_buffer_pool_instance...innodb_buffer_pool_instances = 2 表示我们需要两个buffer_pool实例 那么每个pool_instance占多少内存呢,其实就是我们之前的总数除一下 Innodb_buffer_pool_size...配置buffer pool时的注意事项 innoDB_buffer_pool_size 必须是 innoDB buffer_pool_insatances * innoDB buffer_pool_chunk_size...mysqld --innodb-buffer-pool-size=8G --innodb-buffer-pool-instances=16 当我们吧pool_size改成8g,instances为16,...mysqld --innodb-buffer-pool-size=2G --innodb-buffer-pool-instances=16 --innodb-buffer-pool-chunk-size
构造方法 multiprocessing.pool.Pool(processes=None, initializer=None, initargs=(), maxtasksperchild=None,...(4) as pool: pool.apply(f) pool.apply(f) pool.apply(f) pool.apply(f)...(4) as pool: result.append(pool.apply_async(f)) result.append(pool.apply_async(f))...result.append(pool.apply_async(f)) result.append(pool.apply_async(f)) result.append(pool.apply_async...(4) as pool: pool.map(f, range(10)) 打印出了: 107 get 0 at 2019-06-27 19:50:30 109 get 2 at 2019-
Buffer Pool的缓冲命中率(我们当然是期望命中率越高越好) 假设我们一共访问了n次页,那么被访问的页已经在Buffer Pool中的次数除以n,那么就是Buffer Pool的缓冲命中率。...---- 四、其他补充知识点 4.1> 多个Buffer Pool实例 在Buffer Pool特别大并且多线程并发访问量特别高的情况下,单一的Buffer Pool可能会影响请求的处理速度。...所以,在Buffer Pool特别大时,可以把它们拆分成若干个小的Buffer Pool,每个Buffer Pool都称为一个实例。它们都是独立的——独立地申请内存空间,独立地管理各种链表。...可以通过设置innodb_buffer_pool_instances的值来修改Buffer Pool实例的个数 每个Buffer Pool实例实际占用多少内存空间呢?...4.3> 配置Buffer Pool时的注意事项 innodb_buffer_pool_size必须是: innodb_buffer_pool_chunk_size * innodb_buffer_pool_instances
static DMMemoryPool* instance(); 44 45 DMMemoryPool(); 46 47 DM_UINT init_memory_pool...(nullptr) 18 { 19 DM_INT mem_size = DMJsonCfg::instance()->GetItemInt("service_info", "memory_pool_size..."); 20 init_memory_pool(mem_size); 21 } 22 23 DM_UINT DMMemoryPool::init_memory_pool(DM_UINT...alloc_memory(DM_UINT size) 62 { 63 if (_unused < size) 64 { 65 DM_LOG(DM_ERROR,"memory pool
采用pool之后,如果goroutine被扩栈了,再还到pool里面,下次拿出来时是一个已扩栈过的goroutine,因此可以避免morestack。...接下来说说这个goroutine pool该怎么写。...我希望接口是这个子的: pool = New() // 创建pool pool.Go(func() { // do something }) 跟调用 go func() { }()...为此,我们要将goroutine抽象成一种资源, func (pool *Pool) Go(f func()) { res := pool.get() res.run(f) ...chan pool *Pool } go func(r *res) { for work := r.ch { work() r.pool.put
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