Bootchart

OpenSource For You - - EXPLORING SOFTWARE GUEST COLUMN -

A very use­ful util­ity for iden­ti­fy­ing boot per­for­mance is the bootchart package. It col­lects the boot data, and pre­pares a beau­ti­ful, de­tailed chart— bootchart.png in the /var/log di­rec­tory. Un­like sys­tem­d­an­a­lyze, this in­cludes the start of the dis­play man­ager. This is the time that mat­ters to the user. With the SSD, bootchart gives the time as 26 sec­onds when the lo­gin screen is ready. The cor­re­spond­ing tim­ing for a SATA root disk is 56 sec­onds orig­i­nally, and 41 sec­onds af­ter de-frag­men­ta­tion. The dif­fer­ence be­tween the two types of disks can be seen from the fol­low­ing ta­ble: Cu­mu­la­tive time SSD root SATA root SATA root re­stored CPU time IO time

Elapsed time 24 sec 44 sec

26 sec 29 sec 343 sec

56 sec 28 sec 177 sec

41 sec

7hH FRnFlusLRn Ls REvLRus. ,/2 WLmH Ls WhH mRsW sLgnL­fiFDnW vDULDElH Ln UHGuFLng ERRW WLmH. 7hH EHnH­fiW RI nR URWDWLRnDl de­lay and min­i­mal uni­form ac­cess time in a SSD disk gives a new life to an old sys­tem.

A 60 GB SSD is a cost-ef­fec­tive op­tion in a desk­top, as it can EH usHG IRU URRW DnG hRmH. 0ulWLmHGLD DnG RWhHU lDUgH filHs FDn EH on the ex­ist­ing SATA or IDb hard disk. This in­vest­ment is likely to re­sult in bet­ter per­for­mance than re­plac­ing the desk­top—un­less, of course, your brand-new desk­top re­lies ex­clu­sively on SSD.

My next project is to re­fresh my netbook. That may hap­pen soon, as more op­tions for 120 GB SSDs are be­com­ing avail­able in In­dia, and lo­cal prices are likely to be­come com­pa­ra­ble to US prices.

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