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Go tried that [1], a failed experiment that was a complex NIH version of the generational hypothesis. They currently use a CMS-stye collector. [1] https://docs.google.com/document/…

Thanks for the corrected evaluation. Just for your awareness, the HotSpot team is working on offering a spectrum of AOT/JIT options under the Leyden project [1]. Currently one has …

That is just a normal JVM with optional Graal components if enabled, but not being used. The default memory allocation is based on a percentage of available memory and uncommitted …

In both the asMap() view unwraps the opinionated Cache facade to the underlying bounded map. There are a lot of little gotchas so it is best to not believe your own results until p…

This was a good attempt but flawed. 1. You should use JMH to handle warmup, jit, timings, averaging of runs, etc. You might enjoy the following talks on the subject, though I am su…

How about the senior engineer level error of forking Doug Lea's concurrent data structures only to make them operate in worst-case time complexity? Found this doozy recently. [1] h…

I think the idea is that the cache is so large that hot data won't be forced out by one-hit wonders. In this 2017 talk [1], the speaker says that Twitter's SLA depends on having a …

You might be interested in this thread [1] where I described an idea for how to incorporate the latency penalty into the eviction decision. A developer even hacked a prototype that…

As the article mentions, Caffeine's approach is to monitor the workload and adapt to these phase changes. This stress test [1] demonstrates shifting back and forth between LRU and …

Yep, no bots. A real bug not only means that I wasted someone else’s time, but reporting is a gift for an improvement. If a misunderstanding then it’s motivation that my project is…

Thanks Jonathan!

I tried to reimplement Linux’s algorithm in [1], but I cannot be sure about correctness. They adjust the fixed sizes at construction based on device’s total memory, so it varies if…

Doesn’t reddit use Cassandra, Solr, and Kafka which uses Caffeine?

I've resorted to using Cmd-Shift-J (scrollback buffer) and grepping that, but its flaky about whether it will honor the command and emit a history file.

That’s in the works, where it adapts from 16mb to terabyte heaps. The current GCs have a max, with lazy allocation and ability to release back to the system periodically, but are n…

It will likely become available for application developers to use. At work, we use it to assist warehouse checkins by allowing the guard to take photos of the truck, paperwork, sea…

Endian indicates the byte order (MSB->LSB, LSB->MSB), but does not change the representation of a bit. The conditional logic says that an even result is 32 and an odd is 0 after a …

I believe it is (!i & 32) because the bitwise version is an incorrect rewrite. [1] https://news.ycombinator.com/item?id=41830016

I'm confused because isn't the bitwise version the inverted logic? If the LSB is 1 then it is an odd value, which should be zero, yet that is shifted to become 32. The original mod…

Oh thank you, I’m glad it’s been helpful.

One optimization for background refresh is coalescing the individual reloads into a batch operation based on a time/space window. Here is how we do it in the Java world. [1] [1] ht…

In a typical LRU cache every read is a write in order to maintain access order. If this is a concurrent cache then those mutations would cause contention, as the skewed access dist…

Nope, I used the default in your github repository (10_000_000). From a quick profile it looked like previous benchmark allocations where crossing into later runs, who were then pe…

Adding Guava testlib's GcFinalization.awaitFullGc() before a benchmark run and -XX:+UseParallelGC, I saw the runtimes decrease by 30s in Bench_Fury_Ordinal and 20s in Bench_ObjectO…