A Shared lock Cost the Same as a Private One at One Thread, and Not at Two
On .NET 10.0.12 a shared lock matched a per-thread lock at one thread and cost more from two up, where Monitor.LockContentionCount left zero.
Topics · 6 articles
#diagnostics
The Query EF Core Writes When You Ask for a Count
On EF Core 10.0.12, AsEnumerable() before Where().Count() sent a full-table SELECT instead of COUNT(*) and allocated 1056.36 KB against 49.53 KB at 1,000 rows.
clrstack Shows the Waiter and syncblk Names the Lock Holder
In a dotnet-dump of a contested lock, clrstack -all marked no thread as the owner. syncblk named it, and a suspended await appeared only in dumpasync.
dotnet-counters Shows the Queue's Delta, Not Its Depth
A thread pool queue held at two thousand work items read 1986 through one provider and -13 through the other, in the same second, in the same process.
Server GC, Workstation GC, and the Numbers Between Them
Server GC finished 2.7 times faster and collected 17 times less often — and made the slowest request in the run 5 to 13 times slower. Both numbers are real.
Where Thread Pool Starvation Actually Comes From
Blocking on a task is the case the thread pool compensates for. Blocking on a sleep or an event is the case it cannot see, and it finished 2.5 times slower.
