Replaying a real session to find the memory cost we never counted
Long sessions kept getting reset after our memory fixes. We nearly capped the context, until a local replay of a real session pointed at tokenization.
EngineeringRead articleBlog
How we think about agents, business and engineering.
All articles
Measuring the memory limit of Durable Objects
The docs say 128 MB, yet our sessions crossed it without always being killed. We deployed a throwaway probe to find out: the reset line fell between 254 and 300 MiB, what matters is how much data is alive at once, and recorded peaks are always a lower bound.
EngineeringDebugging an agent session that kept running out of memory
A user said our agent kept stopping halfway through. Our logs showed no cause of death; the platform metrics showed memory errors, and heap snapshots showed three sources. This is how we tracked it down, the traps we hit, and the numbers after the fix.
Engineering