Hardware Bloom Filter Bit-to-Byte Mapping
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Solution Overview
Problem
Current Bloom filter implementations are inefficient due to sequential software-based operations, leading to high computational overhead and inability to handle certain workloads effectively, particularly in scenarios with high lookup-miss rates and limited memory, resulting in redundant CPU cycles and increased false positive rates.
Innovation Solution
A computer-implemented method and system that uses hardware-assisted operations to accelerate Bloom filter setting and checking by mapping bit addresses to byte addresses and performing bulk operations, allowing for parallel execution and reducing the number of CPU cycles required, thereby improving efficiency and reducing false positives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of hash functions is increased to reduce false positive rate, then the reliability of the Bloom filter is improved, but the computational overhead and device complexity increase
Solution Approach 1:
The patent replaces the traditional software-based sequential Bloom filter operations with hardware-assisted operations. The Bloom filter is implemented using hardware circuits that can perform hash functions and bit operations in parallel, significantly reducing the computational overhead while maintaining the ability to use multiple hash functions to achieve low false positive rates.
Solution Approach 2:
The patent combines multiple hash function operations and bit manipulations into a single hardware circuit that operates in parallel. By merging these operations into unified hardware modules, the system can execute multiple hash functions simultaneously without the sequential overhead of software implementation, thus reducing computational complexity while maintaining reliability.
2Ease of manufacture
If sequential software-based operations are used for Bloom filter, then the ease of implementation is improved, but the productivity and speed of operations deteriorate
Solution Approach 1:
The patent substitutes software-based sequential operations with hardware-based parallel operations. The Bloom filter is implemented using dedicated hardware circuits that can perform hash functions, bit addressing, and logical operations simultaneously, achieving orders of magnitude improvement in operation speed while maintaining implementation feasibility through standardized hardware modules.
Solution Approach 2:
The patent transitions from sequential time-based operations to parallel spatial operations by implementing the Bloom filter in hardware. Multiple hash functions and bit operations that would execute sequentially in software are performed simultaneously in hardware circuits, effectively adding a spatial dimension to the operation execution model and dramatically improving productivity.
3Reliability
If more memory is allocated to the Bloom filter to reduce false positives, then the reliability is improved, but the loss of memory resources increases
Solution Approach 1:
The patent changes the operational parameters of the Bloom filter by implementing it in hardware, which enables the use of more hash functions and larger bit vectors without the computational overhead that would constrain software implementations. This allows optimization of the false positive rate parameter while using memory resources more efficiently through parallel hardware operations.
Data Source
AI summary
A system and method of setting and checking a Bloom filter is provided. The system generates a set of hashed values by applying a number of hash functions to an input value; determines each bit address of a bloom filter corresponding to a hashed value of the set of hashed values; maps each determined bit address from the bloom filter into a corresponding byte address of a register, such that each bit address corresponds to one byte address; writes a byte value into the register for the byte address, wherein each bit of the byte value corresponds to a bit address of the bloom filter and writes each bit of the byte value from the register into the bloom filter for each bit address of the byte address.