• Readers-Writer Lock for Twisted’s Deferred. Many readers can simultaneously access a share at the same time, but a writer has an exclusive access to this share. The following constraints should be met: no reader should be kept waiting if the share is currently not opened to anyone or to only other readers.
      • Once the CD-RW disk is put in the drive, it will not open while in the OS (XP). It reads the disk and its contents fine as well, but just will not open without triggering the manual eject (paper clip). I have replaced the drive before with no success. The current drive I am seeing this problem on is the TSS Corp-CDRW TSL 462 C.
      • Real-Time Resource-Sharing under Clustered Scheduling: Mutex, Reader-Writer, and k-Exclusion Locks Bjorn B. Brandenburg and James H. Anderson¨ Department of Computer Science, University of North Carolina at Chapel Hill Abstract This paper presents the first suspension-based real-time lock-ing protocols for clustered schedulers. Such ...
    • • maintain a lock table as hashed main-mem structure • lookup by lock name • lookup by transaction id • lock/unlock must be atomic operations (protected by critical section) • typically costs several hundred instructions to lock/unlock an item • suppose T1 has an S lock on P, T2 is waiting to get X lock on P, and now T3 wants S lock ...
      • A) wait. The lock will timeout after 1 day (assuming you are using db_record_lock_factory because you have mysql). B) delete the lock record from the lock_db table. DELETE from {prefix}lock_db where resourcekey = 'core_cron';
      • Faced an issue with (0.87.2) cluster which went into a warn state with slow requests $ sudo ceph health detail HEALTH_WARN 1 requests are blocked > 32 sec; 1 osds have slow requests
      • Lecture 9: Practice with monitors. reducing spurious wakeups with notify (instead of notifyAll) by reasoning about preconditions; reader/writer step-by-step. 3-way join problem. Reducing spurious wakeups. A notification causes a waiting thread to wake up, recheck the corresponding predicate, and (if the predicate no longer holds) go back to sleep.
      • Cache tiering: fixing the slow request, waiting for rw locks issue #2374 wonzhq wants to merge 1 commit into ceph : master from wonzhq : wip-9285 Conversation 16 Commits 1 Checks 0 Files changed
      • ceph daemon osd.X dump_ops_in_flight waiting for rw locks. Yesterday I got my hands on a Ceph cluster which had a very high number, over 2k, of slow requests. On all OSDs they showed ‘waiting for rw locks’ This is hard to diagnose and it was. Usually this is where OSDs are busy connecting to other OSDs or performing any other network actions.
      • Jul 05, 2011 · RAC: Query all Blocking Locks in the databases -- ... Query all Blocking Locks in the databases. ... Top waiting Sesions; RAC: List all currently connected users and ...
      • Existing lock /var/run/yum.pid: another copy is running as pid 1174. Another app is currently holding the yum lock; waiting for it to exit... The other application is: PackageKit
      • Nov 05, 2017 · In a nutshell, FIFO grants locks to those who requested it first (i.e., transactions that are ahead of the queue, unless they’re incompatible with the locks that are currently granted). Because of its simplicity, most database vendor have settled for FIFO and its variants without considering other strategies.
      • Some debugging infrastructure, including the ability to adjust the level of debug output on a per-file basis. Signed-off-by: Sage Weil <***@newdream.net>---fs/ceph ...
      • Dec 10, 2019 · I/O thread 6 state: waiting for i/o request (write thread) reads 0 writes 1847360 requests 7065434 io secs 1063.904923 io msecs/request 0.150579 max_io_wait 2569.244000 This is from another post There are more details on InnoDB status in the output from SHOW INNODB STATUS and SHOW STATUS.
    • Dec 15, 2005 · So Reader/Writer locks (RW) can be used in kernel and user level code to allow multiple READERS of, for instance, a data structure, to access the structure while allowing only a single WRITER at a time within the bounds of the rwlock(). A RW locks (rwlock(9F), rwlock(3THR)) is more complex that a simple mutex.
      • Sign in. android / kernel / msm / 87eb367003887cdc81a5d183efea227b5b488961 / . / fs / ceph / addr.c. blob: 412593703d1ec0519410ee6653bd8b55be5b0e2a #include "ceph ...
      • Since the whole Ceph I/O model is async the less waiting, scheduling, contention, etc. happens the better. Currently Ceph is CPU bound, that's why they are trying to improve CPU perf.
      • To specify the log file directory, you can use the option -o <outputdir>.When activated, Database Analyzer saves the analysis data that is collected in the course of a day, as well as other log files, in the /YYYYMMDD subdirectories of the log file directory.
      • The 23-year-old Tuch is coming off 20 goals and 52 points last season and is signed to a reasonable $4.75 million for six years beyond this current season. The Bruins might have to part with a player like Jake DeBrusk in a trade package to land a player like Tuch, but it would be worth it if they could lock down the second line right wing spot for the long term with a solid, big and skilled player like Tuch.
      • Sep 19, 2016 · Which also explains why we are currently aiming for a SAN (suffice to say we can live with less than 100TB for the next 5 years) Using a SAN would also take the complexity outof managing something like CEPH or other software based solutions; While I wouldn't go Ceph, there are some software solutions you can buy as hardware that have Cinder ...
      • Apr 30, 2015 · The optimistic lock is valid right after acquiring the lock. In contrast to normal read locks an optimistic lock doesn't prevent other threads to obtain a write lock instantaneously. After sending the first thread to sleep for one second the second thread obtains a write lock without waiting for the optimistic read lock to be released.
    • On my current system with a full mirror including ISO images and some local packages (see HowTos/CreateLocalRepos), this requires ~28GB (size not verified since CentOS 5) Find a Current Mirror near you that supports rsync, set up a directory structure already populated with content from the 6.8 DVDs or CDs.
      • Write-preferring RW locks avoid the problem of writer starvation by preventing any new readers from acquiring the lock if there is a writer queued and waiting for the lock; the writer will acquire the lock as soon as all readers which were already holding the lock have completed.
      • Simplicity. IF RW locks provide fairness or favor readers or writers, there is more overhead to the lock. By providing such a simple synchronization mechanism, access to the lock is fast. Usage of this lock may be most appropriate for situations where reader-locks are needed, but quickly acquiring and releasing the lock is similarly important.
      • Ceph. Ceph is a unified, distributed, replicated software defined storage solution that allows you to store and consume your data through several interfaces such as Objects, Block and Filesystem. I've been working with Ceph since 2012, even before the first stable version release, helping on the documentation and assisting users.
      • A common application is testing for the arrival of new files. Since inotify must be given the name of an existing filesystem object to watch, the directory containing the new files is provided.
      • If lock is already locked for writing by another thread or if another thread is already waiting to lock lock for writing, this function will block until lock is unlocked by the other writing thread and no other writing threads want to lock lock. This lock has to be unlocked by g_static_rw_lock_reader_unlock(). GStaticRWLock is not recursive. It ...
      • deadlock = you locked "row x". they locked "row y". You need to lock "row y", you get blocked by them. They now need to lock "row x". They get blocked by you. You are now deadlocked - waiting on eachother. We terminate one of the statements (else you and they would just sit there forever waiting for eachother).
    • The lowest-priced brand-new, unused, unopened, undamaged item in its original packaging (where packaging is applicable). Packaging should be the same as what is found in a retail store, unless the item is handmade or was packaged by the manufacturer in non-retail packaging, such as an unprinted box or plastic bag.
      • Dec 15, 2005 · So Reader/Writer locks (RW) can be used in kernel and user level code to allow multiple READERS of, for instance, a data structure, to access the structure while allowing only a single WRITER at a time within the bounds of the rwlock(). A RW locks (rwlock(9F), rwlock(3THR)) is more complex that a simple mutex.
      • RecursiveWriteCount: This property get the number of times the current thread has entered the lock in write mode, which point to the recursion. WaitingReadCount : This property is used to get the total number of threads which are waiting to enter the lock in read mode.
      • Jan 26, 2016 · Slow requests with Ceph: ‘waiting for rw locks’ Slow requests in Ceph When a I/O operating inside Ceph is taking more than X seconds, which is 30 by default, it will be logged as a slow request. This is to show you as a admin that something is wrong inside the cluster and you have to take action.
      • Jan 06, 2017 · Soon this work will be merged in ceph-ansible. V. Upcoming work. The current LIO iblock + krbd iSCSI implementation has some limitations: Limited to Active/Passive (ALUA active optimized/active non-optimized) because of RBD exclusive lock feature; Eventual support for PGRs will require many new callouts and hooks into the block layer
      • Apr 12, 2011 · Hold events are normal for software execution and are ideally as short as possible, while contention events can cause performance issues as threads are waiting for locks. The output has caught a spin event for the lock at address 0x8089ab8 (no symbol name) from the code path location nscd`_nscd_restart_if_cfgfile_changed+0x3e , which was for 38 us.
      • 14.18.3 InnoDB Standard Monitor and Lock Monitor Output The Lock Monitor is the same as the Standard Monitor except that it includes additional lock information. Enabling either monitor for periodic output turns on the same output stream, but the stream includes extra information if the Lock Monitor is enabled.
      • Waiting time [ms] for frequency measurement Default: 1.6 s (maximum possible value) If the time from Frequency window has elapsed, the next positive edge from track A is awaited for this time (frequency mode A only).
      • This lock allows for simultaneous readers to exist but only one writer to exist for use-cases where it is useful to have such types of locks. Currently a reader can not escalate its read lock to a write lock and a writer can not acquire a read lock while it is waiting on the write lock. In the future these restrictions may be relaxed.
      • SEMAPHORES: Threads waiting for a semaphore and stats on how the number of times threads have needed a spin or a wait on a mutex or rw-lock semaphore. If this number of threads is large, there may be I/O or contention issues.
    • On my current system with a full mirror including ISO images and some local packages (see HowTos/CreateLocalRepos), this requires ~28GB (size not verified since CentOS 5) Find a Current Mirror near you that supports rsync, set up a directory structure already populated with content from the 6.8 DVDs or CDs.
      • waiting for rw locks. The OSD is waiting to acquire a lock on a placement group for the operation. waiting for subops. The OSD is waiting for replica OSDs to apply the operation to the journal. no flag points reached. The OSD did not reach any major operation milestone. waiting for degraded object
      • Lecture 9: Practice with monitors. reducing spurious wakeups with notify (instead of notifyAll) by reasoning about preconditions; reader/writer step-by-step. 3-way join problem. Reducing spurious wakeups. A notification causes a waiting thread to wake up, recheck the corresponding predicate, and (if the predicate no longer holds) go back to sleep.
      • Apr 13, 2017 · ceph osd perf osd fs_commit_latency(ms) fs_apply_latency(ms) 136 9 9 135 22 22 134 38 38 45 171 174 44 77 84 133 101 105 132 47 47 130 109 116 84 20 22 15 68 78 99 64 76 98 46 56 97 10 10 96 10 10 95 28 43 94 54 58 93 40 43 92 18 20 91 19 20 90 37 41 9 7 9 89 40 44 88 31 34 87 43 42 86 27 30 83 35 39 82 44 53 81 81 87 80 11 11 8 10 16 79 15 17 ...
      • One final note - this lock is a bit fatter, in memory use, than the Windows one in the case that is contended - because it allocates one or two windows Events per lock, while the slim lock avoids this. The slim lock likely does it by directly supporting the slim lock behavior in the kernel, so the control word can directly be used as part of ...
    • The perf histograms build on perf counters infrastructure. Histograms are built for a number of counters and simplify gathering data on which groups of counter values occur most often over time. Perf histograms are currently unsigned 64-bit integer counters, so they’re mostly useful for time and sizes.
      • Current information about the Database Analyzer most recently started. ... DBAN_RW_LOCKS.csv: ... waiting for log, waiting for I/O, waiting for region access) Log File.
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      • This can cause problems as programs wait for the lock to be freed. Since the reason the lock fails is because locking is unsupported, the attempt to obtain a lock will never work. This results in either the applications waiting forever, or aborting their operation. These results will also vary with the support of the server.
      • holding() is true if the current CPU already holds the lock. why is it bad for a CPU to re-acquire a lock it already has? And release(): 1415: why not just lock->locked = 0? Let's look at the IDE disk driver as an example of xv6's use of locks. Sheet 34. The file system kernel code calls ide_rw() to read or write a block of data from/to the disk.
      • I'm trying to get to the bottom of the 1205 exceptions I've been getting. I understand it's a lock, but I don't understand exactly why it's happening and how I can fix (either by recoding, table restructure, or mysql configuration).

Ceph currently waiting for rw locks

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Aug 05, 2009 · The OSD client is responsible for reading and writing data from/to the object storage pool. This includes determining where objects are stored in the cluster, and ensuring that requests are retried or Apr 15, 2019 · CROWN-Car is a smart car lock app。

Indicates to execute the DCMT command on all or a list of data sharing group members. For more information about broadcasting and broadcast-parms syntax, see How to Broadcast System Tasks in the Using System Tasks section SEMAPHORES: Threads waiting for a semaphore and stats on how the number of times threads have needed a spin or a wait on a mutex or rw-lock semaphore. If this number of threads is large, there may be I/O or contention issues.

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Apr 22, 2019 · How to Format a CD. This wikiHow teaches you how to format a CD-RW or DVD-RW that is having problems playing or loading information. You cannot format a CD-R or a DVD-R that has already been burned or otherwise written to. Mar 30, 2008 · ImgBurn locks up at "Querying Current 'Book Type' Setting". Computer locks up, cannot End Task. I have to hold power button down for 4+ seconds to shutdown & restart. I am a first time user of ImgBurn, haven't been able to burn with it yet. I am currently using Roxio Creator to burn .ISO images, works fine. Once the CD-RW disk is put in the drive, it will not open while in the OS (XP). It reads the disk and its contents fine as well, but just will not open without triggering the manual eject (paper clip). I have replaced the drive before with no success. The current drive I am seeing this problem on is the TSS Corp-CDRW TSL 462 C.

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Sep 19, 2016 · Which also explains why we are currently aiming for a SAN (suffice to say we can live with less than 100TB for the next 5 years) Using a SAN would also take the complexity outof managing something like CEPH or other software based solutions; While I wouldn't go Ceph, there are some software solutions you can buy as hardware that have Cinder ... .

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This function takes an RW-mutex lock before it tries to lock the file, so there is the possibility that this function may block for a short time if another goroutine is trying to take any action. The actual file lock is non-blocking. If we are unable to get the exclusive file lock, the function will return false instead of waiting for the lock. Impaired social interaction nursing care plan for schizophrenia
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