| Feature | "whalin" Memcached for Java | Spymemcached | Xmemcached |
|---|---|---|---|
| Based On | Blocking IO | Java NIO | Java NIO |
| License | GPL 3.0 | Apache 2.0 | Apache 2.0 |
| Latest Version | 3.0.2 (l/u 2013) | 2.12.3 (l/u 2017) | 2.4.7 (l/u 2021) |
| Stability | Widely used and stable | Less stable with reports of timeouts | High performance, carefully tuned for top performance |
| Support for CAS Operations | No | Yes | Yes |
| Performance | Good performance with blocking IO | Higher access rate but with stability issues | Extremely high performance, especially in high concurrency |
| Resource Consumption | Higher due to traditional IO model | Lower due to NIO model | Lower, optimized for less resource consumption |
| Concurrency Handling | Not specified | Single-threaded approach | Multithreaded, optimized for high concurrency |
| Comment | Deprecated/Legacy | Has connection issues + legacy | Semi-actively developed + Spring integration |