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.
Topics · 6 articles
#memory
The Box You Pay For Is the One That Escapes
Assigning a struct to an interface allocated 0 bytes. Passing it across a call boundary allocated 24. A constrained generic allocated none, until its body asked for an object.
The Middleware That Looked Expensive Was Not the One Spending the Bytes
Removing UseRouting dropped per-request allocation by 2.29 KB in isolation — separated from authorization's share, routing itself costs about 24 bytes.
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.
The State Machine Your async Method Compiles Into
An async method that never suspends allocates nothing. The same method, suspended once, allocates 160 bytes. The cost is not the keyword — it is the suspension.
