subtasks is not ready yet. ## • ready() Return True if all of the subtasks are ready. ## • completed_count() Returns the number of completed subtasks. ## • revoke() Revokes all of the subtasks. ## • iterate() 'delivery_info': {'delivery_tag': 1, 'exchange': u'testexchange', 'message_count': 0, 'redelivered': False, 'routing_key': u'testkey'}, 'properties': simultaneously. Defaults to the number of CPUs/cores available. ## • CELERYD\_PREFETCH\_MULTIPLIER How many messages to prefetch at a time multiplied by the number of concurrent processes. The default is

## +23 ## Lock-free Atomic Shared Pointers Without a Split Reference Count? It Can Be Done! DANIEL ANDERSON  Daniel Anderson and concurrency patterns • How existing atomic are implemented (the split reference count technique) • Deferred reclamation, i.e., garbage collection in C++ ## Some assumed knowledge • and concurrency patterns • How existing atomic are implemented (the split reference count technique) • Deferred reclamation, i.e., garbage collection in C++ ## Some assumed knowledge •

遗留问题 • 工作量评估 ## 背景 目前curvefs client版本对删除unlink和rmdir的设计只有简单的删除inode和dentry结构，遗留了nlink和lookup count相关的内容还未实现，是不完备的。本文首先调研moosefs，chubaofs等分布式系统，参考并设计解决上述遗留问题。 当前删除接口代码如下： CURVEFS_ERROR FuseClient: 目录的nlink字段初始值为2，并且在目录下，每创建一个新目录，nlink字段也会+1，删除目录nlink相应的减1。 目录不支持硬链接。 ## 二 是删除时lookup count未考虑： lookup count 指的是文件的访问计数。当文件/目录被打开时，即使文件/目录已经被另一个进程删除了（nlink=0），该文件/目录仍然可以被打开的进程访问，不会造成崩溃或报错，我们的curvefs也需要实现这样的语义。 about an inode * This function is called when the kernel removes an inode * The inode's lookup count increases by one for every call to * fuse reply entry and fuse reply create. The nlookup parameter

subtasks is not ready yet. ### • ready(.) Return True if all of the subtasks are ready. • completed count(). Returns the number of completed subtasks. revoke(.). Revokes all of the subtasks. • iterate() 'delivery_info': {'delivery_tag': 1, 'exchange': u'testexchange', 'message_count': 0, 'redelivered': False, 'routing_key': u'testkey'), 'properties': snapshot import Polaroid class DumpCam(Polaroid): def shutter(self, state): if not state.event_count: # No new events since last snapshot. return print("Workers: %s" % (pformat(state

the subtasks is not ready yet. • ready() Return True if all of the subtasks are ready. • completed_count() Returns the number of completed subtasks. • revoke() Revokes all of the subtasks. • iterate() 'delivery_info': {'delivery_tag': 1, 'exchange': u'testexchange', 'message_count': 0, 'redelivered': False, 'routing_key': u'testkey'}, 'properties': snapshot import Polaroid class DumpCam(Polaroid): def shutter(self, state): if not state.event_count: # No new events since last snapshot. return print("Workers: %s" % (pformat(state

subtasks is not ready yet. • ready() Return True if all of the subtasks are ready. • completed_count() Returns the number of completed subtasks. • revoke() Revokes all of the subtasks. • iterate() 'delivery_info': {'delivery_tag': 1, 'exchange': u'testexchange', 'message_count': 0, 'redelivered': False, 'routing_key': u'testkey'}, 'properties': snapshot import Polaroid class DumpCam(Polaroid): def shutter(self, state): if not state.event_count: # No new events since last snapshot. return print("Workers: %s" % (pformat(state

subtasks is not ready yet. ## • ready() Return True if all of the subtasks are ready. ## • completed_count() Returns the number of completed subtasks. ## • revoke() Revokes all of the subtasks. ## • iterate() 'delivery_info': {'delivery_tag': 1, 'exchange': u'testexchange', 'message_count': 0, 'redelivered': False, 'routing_key': u'testkey'}, 'properties': snapshot import Polaroid class DumpCam(Polaroid): def on_shutter(self, state): if not state.event_count: # No new events since last snapshot. return print("Workers: %s" % (pformat(state

minutes/hours make sure you enable the -Ofair“ command-line argument to the celery worker. See Prefork pool prefetch settings for more information, and for the best performance route long-running and short-running subtasks isn't ready yet. • ready() Return True if all of the subtasks are ready. • completed_count() Return the number of completed subtasks. • revoke() Revoke all of the subtasks. • join() Gather autoscale/maxtasksperchild/time limits are used. That is, the number is the process index not the process count or pid. • %i - Pool process index or 0 if MainProcess. Where -n worker1@example.com -c2 -f %n-%i

minutes/hours make sure you enable the -Ofair“ command-line argument to the celery worker. See Prefork pool prefetch settings for more information, and for the best performance route long-running and short-running subtasks isn't ready yet. • ready() Return True if all of the subtasks are ready. • completed_count() Return the number of completed subtasks. • revoke() Revoke all of the subtasks. • join() Gather autoscale/maxtasksperchild/time limits are used. That is, the number is the process index not the process count or pid. • %i - Pool process index or 0 if MainProcess. Where -n worker1@example.com -c2 -f %n-%i

subtasks is not ready yet. • ready() Return True if all of the subtasks are ready. • completed_count() Returns the number of completed subtasks. • revoke() Revokes all of the subtasks. • iterate() 'delivery_info': {'delivery_tag': 1, 'exchange': u'testexchange', 'message_count': 0, 'redelivered': False, 'routing_key': u'testkey'}, 'properties': snapshot import Polaroid class DumpCam(Polaroid): def on_shutter(self, state): if not state.event_count: # No new events since last snapshot. return print("Workers: %s" % (pformat(state