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The efficiency of datacenters is important consideration for cloud service providers to make their datacenters always ready for fulfilling the increasing demand for computing resources. Container-based virtualization is one approach to improving efficiency by reducing the overhead of virtualization. Resource overcommitment is another approach, but cloud providers tend to make conservative allocations...
Lock reservation, a powerful optimization for Java locks, is based on the observation that, in Java, each lock tends to be dominantly acquired and released by a specific thread. Reserving a lock for such a dominant thread allows the owner thread of the lock to acquire and release the lock without any atomic read-modify-write instructions. A recently proposed algorithm has embodied...
Selector code indexing is a simple and effective way of optimizing method lookups. However, it has not been considered practically applicable in Smalltalk, because the space overhead is prohibitive. We propose a new technique called “dispatch caches indexed by selector codes” (CISCO), which maintains a small number of dispatch tables indexed by a small number of selector codes. The space overhead...
OpenJPA is an implementation of the Java persistence API (JPA) for Apache, with a caching layer for databases queries to share cached objects among multiple client sessions. This is a critical component for high performance, since the caching layer can handle many database requests. However the performance is limited when an application includes write transactions, because the current OpenJPA cache...
The dynamic scripting language PHP has become enormously popular for implementing lightweight web applications, and is widely used as a server-side scripting language for web servers. To contrast the performance of PHP and JSP for this purpose, we used the SPECweb2005 benchmark, which provides three application scenarios implemented in both PHP and JSP. This paper describes and contrasts the results...
Besides being an in-memory-oriented computing framework, Spark runs on top of Java Virtual Machines (JVMs), so JVM parameters must be tuned to improve Spark application performance. Misconfigured parameters and settings degrade performance. For example, using Java heaps that are too large often causes a long garbage collection pause time, which accounts for over 10–20% of application execution time...
Improving memory utilization is important for improving the efficiency of a cloud datacenter by increasing the number of usable VMs. Memory over-commitment is a common technique for this purpose. Transparent Page Sharing (TPS) is a technique to improve the utilization by sharing identical memory pages to reduce the total memory consumption. For a cloud datacenter, we might expect TPS will reduce memory...
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