TLSF: a new dynamic memory allocator for real-time systems

Masmano, Miguel; Ripoll, Ismael; Crespo, Alfons; Real, Jorge

doi:10.1109/emrts.2004.1311009

Cited by 91 publications

(75 citation statements)

References 7 publications

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“…The performance of memory allocator has been studied for decades [35], [36] because it can be very important for applications requiring dynamic memory management.…”

Section: Scalable Memory Allocatormentioning

confidence: 99%

A Comparative Analysis of RTOS and Linux Scalability on an Embedded Many-core Processor

Matsubara

Takada

2018

Journal of Information Processing

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Current embedded systems are usually based on real-time operating system (RTOS). In the near future, embedded systems will include parallel applications for tasks like autonomous driving, and adopt many-core processors to satisfy the performance requirements. However, traditional RTOSes are not designed for high performance applications and whether they can scale well on many-core processors remains unclear. Meanwhile, research has shown that Linux can provide good scalability for processors with tens of cores. In this paper, an experiment environment based on a traditional multi-core RTOS (TOPPERS/FMP) and an off-the-shelf 72-core many-core processor (TILE-Gx72) is presented. By a comparative analysis of RTOS based and Linux based runtime systems, several bottlenecks in RTOS are identified and the methods to avoid them are proposed. After that, the PARSEC benchmark suite is used to evaluate the performance of RTOS and Linux. The results show that the optimized RTOS runtime system tends to deliver better scalability than Linux in many cases. Therefore, we believe that traditional RTOS like TOPPERS/FMP can still be a good choice for embedded many-core processors in the near future.

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“…The performance of memory allocator has been studied for decades [35], [36] because it can be very important for applications requiring dynamic memory management.…”

Section: Scalable Memory Allocatormentioning

confidence: 99%

A Comparative Analysis of RTOS and Linux Scalability on an Embedded Many-core Processor

Matsubara

Takada

2018

Journal of Information Processing

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“…For completeness, in this section we describe the allocator presented in (Masmano et al, 2003;Masmano et al, 2004), a dynamic memory allocation called TLSF (Two-Level Segregated Fit). A more detailed description of the algorithm internals can be found in (Masmano et al, 2007).…”

Section: Tlsf Overviewmentioning

confidence: 99%

“…The execution of Ada programs requires the availability of dynamic memory management which was not supported by the real-time operating system. A preliminary design and implementation of the allocation algorithm was presented in (Masmano et al, 2003;Masmano et al, 2004). During the evaluation process of this allocator we found another allocator proposal, called Half-fit (Ogasawara, 1995), with a similar approach to meeting real-time constraints but with very high fragmentation.…”

Section: Introductionmentioning

confidence: 99%

A constant-time dynamic storage allocator for real-time systems

et al. 2008

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Abstract. Dynamic memory allocation has been used for decades. However, it has seldom been used in real-time systems since the worst case of spatial and temporal requirements for allocation and deallocation operations is either unbounded or bounded but with a very large bound.In this paper, a new allocator called TLSF (Two Level Segregated Fit) is presented. TLSF is designed and implemented to accommodate real-time constraints. The proposed allocator exhibits time-bounded behaviour, O(1), and maintains a very good execution time. This paper describes in detail the data structures and functions provided by TLSF. We also compare TLSF with a representative set of allocators regarding their temporal cost and fragmentation.Although the paper is mainly focused on timing analysis, a brief study and comparative analysis of fragmentation incurred by the allocators has been also included in order to provide a global view of the behavior of the allocators.The temporal and spatial results showed that TLSF is also a fast allocator and produces a fragmentation close to that caused by the best existing allocators.

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“…The above mentioned works approach memory allocation from hardware architecture point of view. Masmano et al (2004) developed a new dynamic storage allocation algorithm called Two Level Segregated Fit memory allocator for Real-Time Operating Systems (RTOS). It provided explicit allocation and deallocation of memory blocks.…”

Section: Related Workmentioning

confidence: 99%

Intelligent Memory Allocation based on Fuzzy Logic

2014

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Based on the Computerized Parkinson's Law "work expands so as to fill the time available for its completion" (Thimbleby, 1993) it can be deduced that regardless of the size of the memory, there will always be programs to completely fill, or even overload that memory. Thus intelligent/sensible memory allocation process is crucial to system's performance. However, due to the constant increase of processing power and the growth and spread of distributed systems, such as grid and cloud computing, memory allocation becomes a great challenge in the area of memory management today. Making allocation intelligent, so that the memory fragmentation and response time are reduced would be great, and in this research, this was attempted. The research presents Fuzzy Allocator, memory allocator based on fuzzy inference system. The allocator manages to sort the incoming memory requests according to their size and the size of free memory slot (hole). The output of the fuzzy allocator is the order in which the allocation of memory will be performed on the incoming memory requests. It reorders the incoming memory request queue so that the response time is reduced, and fragmentation is minimized.

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TLSF: a new dynamic memory allocator for real-time systems

Cited by 91 publications

References 7 publications

A Comparative Analysis of RTOS and Linux Scalability on an Embedded Many-core Processor

A Comparative Analysis of RTOS and Linux Scalability on an Embedded Many-core Processor

A constant-time dynamic storage allocator for real-time systems

Intelligent Memory Allocation based on Fuzzy Logic

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