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Flash translation layers (FTLs) are the core embedded software (also known as firmware) of NAND flash-based solid-state drives (SSDs). The relentless pursuit of high-performance SSDs renders FTLs increasingly complex and intricate. Therefore, testing and validating FTLs are crucial and challenging tasks. Directly testing and validating FTLs on SSD hardware are common practices though, they are time-consuming...
NAND flash-based solid-state drives (SSDs), which can serve as the caches of hard disk drives, have gained popularity in large-scale, high-performance storage. A type of advanced error correction code for SSDs, low-density parity-check (LDPC), is required to mitigate a considerable number of errors in the raw data of NAND flash. However, LDPC imposes read performanceoverhead due to the complex decoding...
Low-density parity-check (LDPC) is widely accepted as the baseline error-correction codes offering strong error-correcting capability for future NAND flash-based SSDs. However, LDPC incurs read performance overhead because of its complex decoding procedure. To mitigate such overhead, we propose the error-correcting cache (EC-Cache) that exploits the “error locality” of NAND flash. Error locality means...
Adopting SSDs as caches for HDD arrays has gained popularity in datacenters because SSDs are superior in handling random reads that HDDs cannot efficiently deal with. Two types of flash memory cells are available for building SSD caches, single-level cells (SLC) and multi-level cells (MLC). MLC is more appealing than SLC because it can achieve higher cache capacity at the same cost. However, we see...
Option pricing is an important problem in computational finance due to the fast-growing market and increasing complexity of options. For option pricing, a model is required to describe the price process of the underlying asset. The GARCH model is one of the prominent option pricing models since it can model stochastic volatility of the underlying asset. To derive expected profit based on the GARCH...
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