Comparing Cpp And Erlang For Motorola Telecoms Software

Phil Trinder & Computer Science Department Heriot-Watt University, UK David King Software & Systems Engineering Research Motorola Labs, UK Comparing C++ and Erlang for Motorola Telecoms Software Henry Nyström Erlang Training & Consulting

High-Level Techniques for Distributed Telecoms Software ,[object Object],[object Object],[object Object],[object Object]

High-Level Techniques for Distributed Telecoms Software ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Erlang Comparisons ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Research Questions: Potential Benefits ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Research Questions: Feasibility ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Research Strategy ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

1 st Component Engineered: Data Mobility Component (DM) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

2 nd Component Engineered: Despatch Call Controller (DCC) ,[object Object],[object Object],[object Object]

Two Erlang DM Implementations ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

RQ3 Performance 1: Throughput ,[object Object],[object Object],940 230 480 Pure Erlang DM Erlang/C DM C++ DM

RQ3 Performance 1: Throughput ,[object Object],[object Object],[object Object],[object Object],940 230 480 Pure Erlang DM Erlang/C DM C++ DM

Performance 2: Round Trip Times Pure Erlang is approximately 3 times faster Erlang/C is 26% - 50% slower ms

Performance Analysis ,[object Object],[object Object]

Performance 3: Memory Residence ,[object Object],[object Object],[object Object]

RQ1 Robustness 1: Resilience Load (queries/s) Throughput (queries/s)

RQ1 Robustness 1: Resilience ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Load (queries/s) Throughput (queries/s)

Robustness 2: Availability ,[object Object],[object Object],[object Object],[object Object],DCC Throughput with Repeated Failures

Robustness 2: Availability ,[object Object],[object Object],5-processor DCC with Multiple Failures

Robustness 3: Dynamic Configurability ,[object Object],[object Object],[object Object],[object Object],DCC Throughput with Varying Numbers of Processors

RQ2: Productivity & Maintainability ,[object Object],[object Object],[object Object],[object Object],[object Object]

Productivity: Source Code Sizes DM Implementations DCC Implementations Erlang DCC and DM are less than 1/3 rd of size of C++ impl. Consistent with Wiger & folklore 398 398 Erlang 863 616 247 Erl./C 3101 3101 C++ Total Erlang C/C++ Lang. 4882 4882 Erl. 14.9K 83 14.8K C++ Total Erl. IDL C++ Lang.

[object Object],[object Object],[object Object],Productivity: DM Source Code Sizes

Reasons for difference in Code Size ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Code Difference Example void DataMobilityRxProcessor::processUnsupVer(void) { MSG_PTR msg_buf_ptr; MM_DEVICE_INFO_MSG *msg_ptr; RETURN_STATUS ret_status; UINT16 msg_size; // Determine size of ici message msg_size = sizeof( MM_DEVICE_INFO_MSG); // Create ICI message object to send to DMTX so it sends a Device Info // message to VLR and HLR clients IciMsg ici_msg_object( MM_DEVICE_INFO_OPC, ICI_DMTX_TASK_ID, msg_size); // Retrieve ICI message buffer pointer msg_buf_ptr = ici_msg_object.getIciMsgBufPtr(); // Typecast pointer from (void *) to (MM_DEVICE_INFO_MSG *) msg_ptr = (MM_DEVICE_INFO_MSG *)msg_buf_ptr; // Populate message buffer SET_MM_DEVICE_INFO_DEVICE_TYPE( msg_ptr, SERVER); SET_MM_DEVICE_INFO_NUM_VER_SUPPORTED( msg_ptr, NUM_VER_SUPPORTED); SET_MM_DEVICE_INFO_FIRST_SUP_PROTO_VERS( msg_ptr, PROTO_VERSION_ONE); // Send message to the DMTX task ret_status = m_ici_io_ptr->send(&ici_msg_object); // Check that message was sent successfully if (ret_status != SUCCESS) { // Report problem when sending ICI message sz_err_msg( MAJOR, SZ_ERR_MSG_ERR_OPCODE, __FILE__, __LINE__, "DataMobilityRxProcessor processUnsupVer: failure sending " " device info message to DMTX"); } } Erlang sz_dme_dmtx:cast(device_info) C++

Erlang DCC Reusability Considerable potential for reuse 36% 11 1741 Testing/Stat.s 3% 1 147 Specific Services 61% 26 2994 Reusable Platform Percentage No. Modules SLOC Part

Summary ,[object Object],[object Object],[object Object]

RQ1: Robust & Configurable Systems ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

RQ2: Productivity & Maintainability ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

RQ3: Distributed Functionality ,[object Object]

RQ4: Performance ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

RQ5: Interoperation Costs ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

RQ6: Pragmatics ,[object Object],[object Object]

Conclusions ,[object Object],[object Object],[object Object]

Further Information ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Comparing Cpp And Erlang For Motorola Telecoms Software

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Comparing Cpp And Erlang For Motorola Telecoms Software