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The SSD alone supporting TRIM does not mean that it is supported in RAID0 arrays, which is a very recent development that often requires the latest operating system (eg Windows 10) and drivers. SSDs + RAID0: Make sure TRIM is supported specifically for RAID0 with your chosen brand and operating system. Redundancy should only be considered for separate ‘storage’ drives or arrays, especially since RAID0 sacrifices redundancy the most for performance (if any of the drives in a RAID0 array fails, all the data is lost). RAID0: While there are many different RAID configurations that have trade-offs between speed, redundancy and efficient usage of space, RAID0 is the only configuration that should be considered for performance. Make sure to have a modern operating system with TRIM support or the write performance of the SSD will degrade over time. SSDs: Significantly more expensive on a per GB basis than mechanical hard drives but can have 2 orders of magnitude faster read performance and an order of magnitude faster write performance. NVMe (Non-Volatile Memory Express) is the most highly-recommended storage type for high-performance requirements in reading and writing data. NVMe: Recently, the NVMe price has reduced and performance has improved. There are different ways to increase storage performance: Transient FEA or CFD runs where many results are being written to disk.Distributed Memory Parallel (DMP) solves (in SMP, there is one set of files, in DMP each core has its own set of files and IO becomes a bottleneck).Out of core Sparse Solver in Mechanical.It doesn’t pay to pinch pennies on system memory! Accessing the Hard Drive: Leaving the building and roaming the earth for 1 year and 3 months.System Memory: Taking a walk down the hall to buy a Twix Bar (4 minutes).L2 Cache: Picking up a book from a nearby shelf (12 seconds).L1 Cache: Grabbing a piece of paper from your desk (3 seconds).To compare the proportional speed of these memory levels, we can use the metaphor from this excellent article on the subject: The cache levels are directly on the CPU itself and have various levels, termed L1, L2, etc… The system memory, or RAM, is modularly added to the motherboard, as is the hard drive. There are several levels of memory in ascending size and descending performance that the CPU has access to. To access something not already in the register, the CPU will have to wait for the process to bring it into the register to complete before it can continue.
CPUs have an extremely small amount of memory that they can access immediately. To get an idea why this is, it is useful to consider how the CPU works. If your operating system runs out of memory it will fall back to using the hard drive as ‘virtual’ memory, which will have a catastrophic effect on system performance. In terms of the effect of memory on performance, you either have enough or you don’t. EMAG products more often require more memory and 100+GB is recommended. As of 2016, 64GB of memory has been sufficient for 90% of the FEA and CFD projects completed by OEI engineers. The actual memory required for a particular problem will depend on the mesh, physical models that are enabled, and domain complexity. It is best to have as much memory as financially feasible. Please consult Ansys if you are considering Quad-Core.Ī minimum of 16GB of memory is recommended. NOTE: Quad Core Sockets – In many cases Ansys does not recommend quad core socket systems because of memory bandwidth. Our engineers tend to work with multiple monitors to efficiently move between applications.
Choosing the right hardware to use with Ansys tools will have a significant impact on productivity in terms of model size, performance, and user experience.
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