Posted by Coder.
Results > Posts Filed Under > Reliability
Nov
2
Posted by Coder.
Oracle Enterprise Manager Java Application Diagnostic Expert (JADE)
Oracle Enterprise Manager Java Application Diagnostic Expert (JADE) improves the availability, performance and provides in-depth diagnostics for Java applications with low overhead. It enables:
1. Production diagnostics with no application instrumentation, saving time in reproducing problems
2. Visibility into Java activity including in-flight transactions, allowing administrators to proactively identify issues rather than diagnosing after-the-fact (application hangs, crashes, memory leaks, locks)
3. Tracing of transactions from Java to Database and vice-versa, enabling faster resolution of problems that …
Oct
4
Posted by Coder.
Nati Shalom’s Blog: Why most large-scale Web sites are not written in Java
…similar solutions for addressing the scalability challenges:
On the Data Tier we see the following:
1. Adding a caching layer to take advantage of memory resources availability and reduce I/O overhead
2. Moving from a database-centric approach to partitioning, aka shards
On the Business Logic Tier:
3. Adding parallelization semantics to the application tier (e.g., MapReduce)
4. Moving to scale-out application models to achieve linear scalability
5. Moving away from the classic two-phase commit and …
Jun
23
Posted by Coder.
More tiered compilation
… a repository of information collected from one run and used on another run is on the list for things we want to do in Dolphin. It’s actually on the runtime groups list but we will certainly take advantage of it. There has also been talk of using annotations to give the jit a hint. This actually isn’t too popular since it is too much like “register” declarations in C. It’s only a hint and is too often …
Mar
28
Posted by Coder.
The Multicore Computer Forum Series “ explor[es] the benefits and challenges of Multicore computing.”
High Performance Throughput Computing, Dr. Marc Tremblay, Sun Fellow, Vice President, and Chief Architect, Sun’s Scalable Systems Group
Software and the Concurrency Revolution, Herb Sutter, Microsoft
Architecture Support for Parallel Programming, Dr. Kunle Olukotun, Associate Professor, Stanford University
Mar
20
Posted by Coder.
Sun Sensible
Uniform Utilization of hardware resources ensures scalability:
Uniform Hardware Utilization Through Time (All program Phases use the hardware uniformly)
Uniform Utilization of Hardware Threads (All Hardware Threads are Busy)
Uniform Use of Software Threads (There are enough threads)
Uniform Cache Set Use in the Cache Hierarchy (No cache sets are over subscribed)
Uniform Physical Memory Use (All memory boards used evenly)
Uniform Virtual Memory Use (No Hot Locks)
Feb
10
Posted by coder.
Sun Dialogue Programs
(Q): If you have to pick top 10 things that you must monitor on any server to look for performance and/or scalability issues…what would they be?
Richard McDougall (A): Off the top of my head, in no particular order:
CPU: Check idle time and run queue length.
If there’s a CPU bottleneck, check if it’s an application or kernel CPU utilization issue with mpstat: high percentages of users indicate it’s an application issue. High sys may point to high network load …
Jan
6
Posted by coder.
This case study gives a high level overview of Google’s setup for user authentication, interesting read.
… user authentication is a transactional event that requires fast, reliable, scalable, persistence and robust high-availability. To deliver this level of service, Google Accounts uses Berkeley DB HA for the storage and retrieval of user data and for replication, thereby ensuring scalability and availability.